Which two statements about the use of SCREEN options are correct?

Which two statements about the use of SCREEN options are correct? (Choose two.)

A.
SCREEN options are deployed at the ingress and egress sides of a packet flow.

B.
Although SCREEN options are very useful, their use can result in more session creation.

C.
SCREEN options offer protection against various attacks at the ingress zone of a packet flow.

D.
SCREEN options examine traffic prior to policy processing, thereby resulting in fewer resources used for malicious packet processing.