Which two statements about Packet over SONET are true? (Choose two.)

Which two statements about Packet over SONET are true? (Choose two.)
A . POS is a Layer 2 technology that uses PPP in ATM encapsulation and SONET framing.
B . The Layer 2 frame is encapsulated into a generic HDLC header (not Cisco proprietary HDLC) and placed into the appropriate SONET Payload Envelope.
C . The FCS field can be set to 16 bits on one end and 32 bits on the other end of a POS connection without causing any connectivity issues.
D . The Cisco POS interface supports Cisco HDLC and PPP encapsulation.
E . POS can be used in a point-to-point or point-to-multipoint environment.

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Answer: B,D