When configuring vPC-HM CDP with multiple links to the same switch， are port-channels required？（）

• A、 Each link between the upstream switch and the VEM is an individual subgroup.
• B、 Connections that go to the same upstream switch must be configured with the command channel-group mode active.
• C、 Connections that go to the same upstream switch must be configured with the command channel-group mode passive.
• D、 With vPC-HM CDP， the user can pin traffic from a specific VM to a specific uplink.
• E、 Connections that go to the same upstream switch must be configured with the command channel-group  mode on.