In order to improve link reliability, the OLT device configures Timed lay protection through two uplink ports 0/19/0 and 0/20/0, which of the following commands is optional?
A . Huawei (protect-group-0) hprotect-group member port 0/19/0 role work
B . Huawei (contig) Interface giu 0/19
Huawei (contig-if-giu-0/19) hoftline-tx-off-time 0 500
C . Huawei (protect-group-0) fprotect-group enable
D . Huawei (contig) protect-group 0 protect-target eth-nniport work mode time delay
Answer: B