Users report that IPTV has a long delay in changing channels. In order to improve the channel switching experience of ordinary users, the program pre-join function can be configured. Which of the following configurations can realize program pre-join?

Users report that IPTV has a long delay in changing channels. In order to improve the channel switching experience of ordinary users, the program pre-join function can be configured. Which of the following configurations can realize program pre-join?
A . huawei (config) mlti cast-vlan x
huawei (config-mlan x) igmp program static ip 224.x..x enable
B. huawei (config) #igmp program static ip 224.xxx enable
C. huawei (config)#ml ticast-vlan x
huawei (config-mwlan x) #igmp program add ip 224.xxx prejoin enable
D. huawei (config) #igmp program add ip 224.xxx prejoin an able

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Answer: C