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In order to improve link reliability, the LT device configures the Time delay protection group through two uplink ports 0/19/0 and 0/20/0. Which of the following commands is optional?

In order to improve link reliability, the LT device configures the Time delay protection group through two uplink ports 0/19/0 and 0/20/0. Which of the following commands is optional?
A . huawei ( config ) #interface giu 0/ 19
huawei ( config-if-giu-0/19 ) h offline-tx-off-time0500

B . huawei ( protect-group-0 ) h protect-group member port 0/19/0role work
C . huawei ( protect-group-0 ) a protect-group enable
D . huawei ( config ) =protect-group 0 protect-target sth-nni port work mode time delay

Answer: A

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