To manually add a workstation to a domain, the technician needs to access the System Properties menu where domain settings are configured.
* User Accounts: Manages user accounts but does not handle domain membership.
* System Properties: The correct place to add or change domain membership settings.
* Windows Firewall: Manages firewall settings but not domain membership.
* Network and Sharing: Manages network connections and sharing but not domain settings.
Reference: CompTIA A+ Exam Objectives [220-1102] - 1.6: Given a scenario, configure Microsoft Windows networking features on a client/desktop.

A rootkit (Option A) is a type of malware designed to gain administrative (root) access to a system while hiding its presence. Rootkits can manipulate system processes and files to remain undetected, making them particularly dangerous.
* Trojan (Option B) is malware disguised as legitimate software but doesn't necessarily provide administrative access.
* Worm (Option C) spreads across networks but doesn't grant administrative access.
* Ransomware (Option D) encrypts data and demands a ransom but doesn't typically provide ongoing administrative access.
CompTIA A+ Core 2 References:
* 2.3 - Explain malware types, including rootkits and their purpose .

In the Windows OS, to grant a user permissions equivalent to root-level permissions (which means full control over the system), the user needs to be given:
* Administrator: The Administrator role provides full control over the system, including the ability to install and uninstall software, change system settings, and access all files and directories.
* Power: The Power User role provides some administrative capabilities but not full control. It is a legacy role with fewer permissions than Administrator.
* Default: This refers to a standard user account with limited permissions.
* Superuser: This term is more commonly associated with Unix/Linux systems and is not a specific role in Windows.
Reference:
CompTIA A+ 220-1102 Exam Objectives, Section 2.5: Given a scenario manage and configure basic security settings in the Microsoft Windows OS.
Windows user roles and permissions documentation.

The IT manager is most likely to be concerned about network utilization being significantly increased due to the size of CAD files. Backing up all CAD files to the software's cloud server can result in a large amount of data being transferred over the network, which can cause network congestion and slow down other network traffic.

A recovery key is a code that can be used to unlock a BitLocker-encrypted drive when the normal authentication methods (such as password or PIN) are not available or have been forgotten. BitLocker is a feature of Windows that encrypts the entire drive to protect data from unauthorized access. If a technician is trying to repair a Windows 10 OS that has BitLocker enabled, they will need the recovery key to access the drive and continue the OS repair. SSL key, preshared key, and WPA2 key are not keys that are related to BitLocker or OS repair.