According to the following diagram displayed on the MARS GUI screen, can you tell me the reason that the Push function is not enabled (grayed out)?

According to the following diagram displayed on the MARS GUI screen, can you tell me the reason that the Push function is not enabled (grayed out)?

A.
Because the Incident has not been confirmed by the administrator.

B.
Because MARS cannot push commands to Layer 3 devices.

C.
Because MARS is operating at level 2 and not at level 3.

D.
Because the selected mitigation command is not supported on the HQ-FW-1 device.