Which are two characteristics of the Cisco MDS Series fan modules? (Choose two.)

A.
Supervisor modules shut down the fan modules when the air temperature is below a preset threshold.

B.
If the Fan Status LED turns red, a fan has failed and the module must be replaced.

C.
Fan modules monitor air temperature and shut down if the temperature exceeds a preset threshold.

D.
Fan modules do not require the switch to be powered off in order to be replaced.