A Linux administrator needs to ensure a service no longer starts when a system running SysVinit is booted. Which of the following commands should the administrator use?

'systemctl disable' removes the systemd unit symlinks that cause a service to start automatically at boot, effectively preventing it from launching on subsequent reboots. Note that the question states SysVinit, where 'chkconfig application off' (choice B) is the canonical command - this likely reflects a question error. In a systemd environment, 'systemctl disable' is the correct and supported method to prevent boot-time service startup.

'chkconfig application off' is the correct SysVinit command for disabling a service at boot, but it is marked incorrect here, suggesting the question intends a systemd context despite its stated SysVinit premise.

The 'echo manual' override syntax is specific to the Upstart init system, not SysVinit, and the file path shown (/etc/init/application/override) is malformed with extra spaces.

'service application stop' stops a currently running service instance but has no effect on whether the service is enabled to start automatically on the next boot.