Which Two Statements Describe How Including Cisco IPoDWDM Proactive Protection

Multiple Choice

Which two statements describe how including Cisco IPoDWDM proactive protection in an optical design would minimize packet loss in the event of a fiber cut? (Choose two) .

A) It uses the FEC field on the OTN frame to trigger protection.
B) It uses a "not to exceed" predefined BER threshold to cause traffic redirection.
C) It reroutes the optical circuit after an event that impacts service.
D) It is effective both when you have redundant and nonredundant Layer 3 MPLS paths.