Why is an OC-3 2F-BLSR not feasible?（）

• A、Switch times would exceed 50 ms for an OC-3 BLSR ring.
• B、An equal amount of working and protect bandwidth is required.
• C、DCC bandwidth is not large enough to handle K1/K2 processing.
• D、There is not enough bandwidth in an OC-3 ring to justify BLSR protection.