Refer to the exhibit.

The script defines pidfile as the location containing the process identifier for the running Chef Client and calls the reload() function when the user supplies the reload argument. A reload should signal the existing process rather than start another instance or terminate it permanently. The -p option identifies the PID file that killproc must use, while -HUP sends the hang-up signal commonly used to make a daemon reload its configuration. Consequently, killproc -p $pidfile $exec -HUP correctly targets the Chef Client process recorded in the defined PID file. The other commands use invalid or inappropriate option combinations, such as -n or -pi, and therefore do not correctly reference the PID file in the expected service-script syntax. Option D completes the reload function consistently with the variables already declared in the exhibit.