Which two statements are true about applying a system image file to a Cisco IPS 4240 sensor?

Which two statements are true about applying a system image file to a Cisco IPS 4240 sensor? (Choose two.)

A.
The same system-image file can be applied to any sensor platform.

B.
The system image has an rpm.pkg extension.

C.
You can use ROMMON to use the TFTP facility to copy the system image onto the sensor

D.
The system image file contains a sys identifier