What does an operation (op) script do?

A.
Instructs the Junos OS to perform a set of actions whenever the script is run manually or
called by another script

B.
Instructs the Junos OS to perform a set of actions based on its location in the
configuration.

C.
Instructs the Junos OS to perform a set of actions during the process of activating
configuration changes.

D.
Instructs the Junos OS to perform a set of actions automatically based on operational
status of the device.