【单选题】
A <{p}>huawei(protect-group-0)hprotect-group member port 0/19/0 role work<{strong}><{/strong}><{/p}>
B <{p}>huawei(contig)Interface giu 0/19Huawei(contig-if-giu-0/19)hoftline-tx-off-time 0 500<{/p}><{p}><{/p}>
C <{p}>huawei(protect-group-0)fprotect-group enable<{strong}><{/strong}><{/p}>
D <{p}>huawei(config)#igmp program add ip 224.x.x.x prejoin anable<{strong}><{/strong}><{/p}>
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