Comprehensive and Detailed Explanation From Exact Extract:
The su (substitute user) command is used in Linux to switch to another user account, most commonly to escalate privileges by switching to the root (administrator) account. It allows administrative tasks to be performed in a terminal session.
A: runas is a Windows command for executing a program under another user's context.
B: cmcl is not a valid Linux or administrative command.
C: net user is a Windows command for managing local user accounts.
Reference:
CompTIA A+ 220-1102 Objective 1.9: Identify common features and tools of the Linux client/desktop OS.
Study Guide Section: Linux command-line tools - su, sudo

An MSDS providessafety and emergency procedures, such as what to do if a battery leaks or catches fire. It is not a technical or setup guide.
FromTravis Everett - CompTIA A+ All-in-One Exam Guide:
"An MSDS contains safety information, including handling, storage, and emergency procedures related to potentially hazardous components like UPS batteries."

Comprehensive and Detailed Explanation From Exact Extract:
If the system fails to boot after removing the USB installation media, it often means the BIOS is not pointing to the correct boot device. This typically involves an issue with the BIOS settings-such as UEFI being disabled when the OS was installed in UEFI mode.
FromAll-in-One Exam Guideby Travis Everett:
"One of the most common post-installation issues is failing to configure the boot mode correctly in BIOS. If an OS is installed in UEFI mode, the UEFI boot must be enabled, otherwise the system won't detect the bootloader."

Comprehensive and Detailed Explanation From Exact Extract:
The net use command in Windows is used to map (assign) a shared drive from the command line. The syntax typically looks like: net use X: \server\share where X is the drive letter and \server\share is the network path.
A). pathping tests network latency and packet loss.
B). nslookup is used for DNS troubleshooting.
D). tracert shows the route packets take to reach a destination - not for drive mapping.
Reference:
CompTIA A+ 220-1102 Objective 1.7: Given a scenario, troubleshoot common operating system problems.
Study Guide Section: Command-line tools - net use for drive mapping

When DHCP isn't enabled, static IPs must be assigned manually, so the engineering team provides the IP details.
FromTravis Everett - All-in-One Exam Guide:
"If DHCP is unavailable, technicians need the static IP configuration to connect devices to the network." .