A remote office has a T1 WAN link to headquarters and a T1 Internet connection. The client requests WAN redundancy to headquarters with similar bandwidth.
What two connection types satisfy this requirement? (Choose two.)
A . Secondary T1 WAN circuit
B . ISDN BRI
C . IPSec Tunnel over the Internet
D . DWDM l
E . POTS Line T1 WAN
Answer: AC