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.