According to the Official CompTIA A+ Core 1 Study Guide (220-1101) 1, the correct answer is A. Document the findings, actions, and solution in the company knowledge base.
The explanation is that after resolving an issue, a technician should always document what was done and how it was fixed. This helps to create a record of the problem and its solution for future reference and also to share knowledge with other technicians.
https://www.comptia.org/training/books/a-core-1-220-1101-study-guide
By documenting the findings, actions, and solution in the company knowledge base, it will help to ensure that if the Issue happens again, the technician or a different technician will be able to quickly and easily find the solution and resolve the Issue. Additionally, it is important to document the solution so that the same Issue does not need to be troubleshot multiple times in the future.

SSH (Secure Shell) encrypts data communications for secure remote login and management of network devices, ensuring all console connections are encrypted.
* Why Not B (LDAP): LDAP is used for directory services and does not encrypt by default.
* Why Not C (FTPS): FTPS encrypts file transfers, not console communications.
* Why Not D (SMTP): SMTP is used for email transmission, not for securing login sessions.
CompTIA A+ Exam Reference: Core 1 (220-1101), Section 2.7, network security protocols.

* C. Installing redundant PSUs (Power Supply Units):
* Redundant PSUs provide fault tolerance by ensuring that if one power supply fails, another will take over seamlessly.
* This is a cost-effective way to increase uptime while waiting for the UPSs to arrive.
Incorrect Options:
* A. Purchasing backup generators: Generators are costly and are typically used for long-term outages, not as an immediate or cost-effective solution.
* B. Increasing input voltage: This is not a practical solution to hardware failures or power issues.
* D. Activating a hot site: A hot site is an expensive, fully operational backup facility that would not be a cost-effective solution for this scenario.
Reference: CompTIA A+ Core 1 Exam Objectives (220-1101), Domain 5.3 - Power-related troubleshooting.

The 2. band is subdivided into up to 14 channels, spaced at 5 MHz intervals from 2412 MHz up to 2484 MHz.
Wi-Fi requires bandwidth of approximately 20 MHz, not 5 MHz. Consequently, a site designer needs to choose the channels that do not overlap. On a WLAN where only the first 11 channels are available, channels
1, 6, and 11 can be selected as non-overlapping. Note: In the Americas, regulations permit the use of channels
1-11 only, while in Europe, channels 1-13 are permitted. In Japan, all 14 channels are permitted.

A syslog server collects and stores log data from various network devices and systems.