What does the activation-key command in the Cisco ASA do?

What does the activation-key command in the Cisco ASA do?

A.
automatically activates the Cisco ASA, allowing it to be configured right out of the box

B.
activates the SSM module in the Cisco ASA, providing intrusion protection and content filtering

C.
applies the activation key to the Cisco ASDM so the Cisco ASA can be managed using a web interface

D.
applies the activation key to the Cisco ASA operating system, so that the Cisco ASA is licensed and all features are available