A Linux administrator has downloaded and installed the httpd package. Which of the following commands will start the service immediately and allow the service to start on system boot?

systemctl start httpd immediately brings the httpd service online in the current running session without requiring a reboot, while chkconfig httpd on registers the service to start automatically on future system boots. Together, these two commands satisfy both requirements - immediate activation and persistent boot-time enablement.

systemctl status httpd only queries and reports the current state of the httpd service; it does not start the service, so the immediate-start requirement is not fulfilled.

systemctl.start uses a dot separator instead of a space, which is invalid syntax for the systemctl command and will produce a command not found error at runtime.

chkconfig httpd on 6 attempts to enable the service specifically for runlevel 6, which is the system halt or reboot runlevel; the service would not be enabled for normal multi-user boot runlevels.