The modular BlackDiamond 6804 switch supports the following legacy WAN modules? (Choose all three that apply)
A. 2-port SONET/SDH OC-12c/STM-4 PoS
B. 4-port SONET/SDH OC-3c/STM-1 PoS
C. 4-port SONET/SDH OC-3/STM-1 ATM
D. 16-port SONET/SDH T3/E3 PoS/ATM