Using splitvg to create a snapshot volume group of rootvg results in an error.  What is the most likely cause of the error（）

• A、There is not an available disk to allocate to the snapshot volume group
• B、One of the physical volumes associated with rootvg has a status of "missing"
• C、Rootvg is running in enhanced concurrent mode
• D、A snapshot volume group cannot be created for the rootvg