Which three statements about security associations (SA) in IPsec are correct? (Choose three.)
A. Phase 2 SAs are used for encrypting and decrypting the data exchanged through the tunnel.
B. An SA never expires.
C. A phase 1 SA is bidirectional, while a phase 2 SA is directional.
D. Phase 2 SA expiration can be time-based, volume-based, or both.
E. Both the phase 1 SA and phase 2 SA are bidirectional.