Explanation
The most likely cause of the server crashing and the application being inaccessible is that the unauthorized software installed by the update is malware that corrupted the system files or compromised the security of the server. To restore access to the application while minimizing downtime, the administrator should scan and remove any malware from the server, and then reformat the server and restore the image from the latest back-up. This will ensure that the server is clean and has a working configuration of the application. Verified References: [How to Remove Malware from a Server]

The administrator should check disk space in the /var directory first when using YUM to update applications on a server. YUM stands for Yellowdog Updater Modified, which is a software package manager for Linux systems that use RPM (Red Hat Package Manager) packages. YUM downloads and installs packages from online repositories and resolves dependencies automatically. YUM stores its cache files in the /var/cache/yum directory by default. These cache files include metadata and package data for each repository that YUM uses.
If there is not enough disk space in the /var directory, YUM may fail to update applications and generate error messages.

Reference:
https://redmondmag.com/articles/2016/02/09/logon-scripts-for-active-directory.aspx

Comprehensive Detailed Explanation with all CompTIA Server+ SK0-005 Study Guide References:If the fans are running at full speed, it may indicate that the CPU or system temperature is too high. This is often caused by a poorly attached or improperly seated heat sink, which prevents efficient heat dissipation.
Reattaching the heat sink with proper thermal paste resolves the issue.
* A. Replace the PSU: Not relevant to temperature control.
* B. Reseat the video card: Would not affect fan speed unless a GPU temperature issue exists, which is not stated here.
* C. Reseat the RAM: Unrelated to fan operation.

This is the best action to perform before applying patches to one of the hosts in a high availability cluster. A high availability cluster is a group of hosts that act like a single system and provide continuous uptime. A high availability cluster is often used for load balancing, backup, and failover purposes. Failover is a process of transferring workloads from one host to another in case of a failure or maintenance. By failing over all VMs (Virtual Machines) from the host that needs to be patched to another host in the cluster, the technician can ensure that there is no downtime or data loss during the patching process. Disabling the heartbeat network is not a good action to perform, as this would disrupt the communication and synchronization between the hosts in the cluster. Fallback cluster services is not a valid term, but it may refer to restoring cluster services after a failover, which is not relevant before applying patches. Setting the cluster to active-active is not a good action to perform, as this would increase the load on both hosts and reduce redundancy. Reference: https://www.howtogeek.com/190014/virtualization-basics-understanding-techniques-and-fundamentals/ https://www.howtogeek.com/428483/what-is-end-to-end-encryption-and-why-does-it-matter/