Presentation, application, and data processing. Presentation, application, and data processing are the three logical and physical computing tiers that make up a three-tier architecture. A three-tier architecture is a type of software architecture that separates an application into three layers or tiers that run on different servers or machines. Each tier performs a specific function or role and communicates with other tiers through well-defined interfaces. The presentation tier is the user interface and communication layer of the application, where the end user interacts with the application. The application tier is the logic or middle tier of the application, where data is processed using business rules. The data processing tier is the data or back-end tier of the application, where data is stored and managed12

A milestone chart is a tool that shows the key events or deliverables of a project along a timeline12. A milestone chart is useful for tracking the progress of a project that has technical tasks and requires a SME's knowledge, because it can provide a high-level overview of the project status, without getting into the details of each task or activity34. A milestone chart can help the PM and the project lead communicate the project achievements, challenges, and expectations to the stakeholders, and also identify any potential risks or delays that may affect the project completion56. A milestone chart is better than the other options because:
A Gantt chart is a tool that shows the tasks, dependencies, durations, and resources of a project along a timeline7. A Gantt chart is more detailed and complex than a milestone chart, and may not be suitable for providing high-level updates to the stakeholders8.
A project organization chart is a tool that shows the roles, responsibilities, and reporting relationships of the project team members and other stakeholders9. A project organization chart is not a tool for tracking project data, but rather for defining the project structure and authority10.
A Program Evaluation Review Technique (PERT) chart is a tool that shows the tasks, dependencies, and critical path of a project along a network diagram. A PERT chart is more focused on the sequence and timing of the project tasks, and may not capture the key milestones or deliverables of the project.
Reference = CompTIA Project+ Certification Study Guide, CompTIA Project+ Certification Exam Objectives, What is a Milestone Chart?1, How to Create a Milestone Chart in Excel in 3 Steps2, Milestone Chart: The Easiest Way to Track Project Milestones3, How to Use Milestones in Project Management4, What is a Gantt Chart?5, Gantt Chart vs Milestone Chart: What's the Difference?6, What is a Project Organization Chart?7, How to Create a Project Organization Chart8, What is a PERT Chart?9, PERT Chart vs Gantt Chart: What's the Difference?10

Avoiding is a conflict resolution technique that involves postponing or withdrawing from a conflict situation. The project manager is using this technique by taking a break and continuing the meeting on another day, hoping that the conflict will resolve itself or become less important over time. This technique may be appropriate when the conflict is trivial, the potential damage is greater than the benefits, or more information is needed before making a decision. Reference = CompTIA Project+ Study Guide: Exam PK0-005, 3rd Edition, Chapter 10: Executing and Closing Projects, page 287; [CompTIA Project+ Certification Exam Objectives], Domain 3: Project Execution, Objective 3.2: Given a scenario, apply appropriate conflict resolution techniques.

A breach of physical security is an unauthorized access or damage to physical assets, such as equipment, data, or personnel. Project documentation that is only kept on a removable device is the best example of a breach of physical security, because it exposes sensitive information to theft, loss, or corruption. If the removable device is not encrypted or protected, anyone who obtains it can access the project documentation and compromise the project integrity, confidentiality, or availability. Therefore, project documentation should be stored in a secure location, backed up regularly, and protected by access controls and encryption.
The other options are not examples of physical security breaches, but rather logical or administrative security breaches. System user IDs being used by multiple individuals is a violation of the principle of least privilege and accountability, which could lead to unauthorized access or misuse of system resources. Printers that do not request user authentication is a lack of proper access control, which could allow unauthorized printing or retrieval of confidential documents. Developers having full access to both development and production environments is a violation of the principle of separation of duties and environments, which could introduce errors, conflicts, or malicious code into the production system. Reference = CompTIA Project+ Study Guide: Exam PK0-005, 3rd Edition, Chapter 9: Security Management1; CompTIA Project+ Certification Study Guide, 3rd Edition, Chapter 9: Security Management2; Types of Security Breaches: Physical and Digital3

A dashboard is a tool that the project manager will most likely use to update the project sponsor and senior stakeholders about the progress of a project. A dashboard is a graphical tool that displays key performance indicators (KPIs), metrics, and data related to a project using charts, graphs, tables, or other visual elements. A dashboard can help to provide a quick and easy overview of the project status and performance and highlight any issues or risks that need attention.