Which of the following statement about guaranteed restriction (GR) in generalized Multiprotocol label Switching (GMPLS) is correct?
A . GR use reestablished backup LSPs with resources reserved and configured.
B . GR can achieve 100% survivability for a single-failure scenario only.
C . GR does not required the signaling of the fault to trigger the restoration.
D . GR calculates a new backup LSP every time a failure occurs.
Answer: A