A systems administrator wants to review the amount of time the NetworkManager service took to...

System boot performance analysis is an important system management task included in Linux+ V8. When administrators need to determine how long services take to start during boot, systemd analysis tools are required.

The correct command is systemd-analyze blame. This command lists all systemd services and shows how long each one took to initialize during the boot process. It is commonly used to identify slow-starting services that may impact system startup performance, including NetworkManager.

The other options are incorrect. resolvectl is used for DNS resolution management and provides no service timing information. journalctl can display logs but does not provide a clear, summarized service startup timing report. systemctl daemon-reload only reloads systemd unit files and does not perform analysis.

Linux+ V8 documentation explicitly references systemd-analyze blame as the correct tool for diagnosing service startup delays. Therefore, the correct answer is D.