Consistency checks and compatibility checks are performed before a Virtual PortChannel （vPC） is created. During a compatibility check， one vPC peer conveys configuration information to the other vPC peer in order to verify that vPC member ports can actually form a PortChannel.     Which statements about a "Virtual PortChannel graceful consistent check" are true？（）

• A、 Graceful consistency check is enabled by default.
• B、 When graceful consistency check is enabled， only the links on the secondary peer device are suspended.
• C、 Graceful consistency check is disabled by default， so to enable this feature， use graceful consistency-check command under VPC domain configuration mode.
• D、 When graceful consistency check is enabled， only the inconsistent VLANs on the secondary peer device are suspended.