Regarding the OSPF route aggregation command, which of the descriptions is correct? (Multiple choice)

• A.not-advertise is the default parameter of the abr-summary command, that is, if advertise is not specified in the abr-summary command, the default is not -advertis
• B.The abr-summary command is a command in the OSPF view
• C.The abr-summary command is a command in OSPF area view
• D.advertise is the default parameter of the abr-summary command, that is, if not-advertise is specified in the abr-sumary command, the default is advertise

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