What could be a possible cause of this situation?

When adding an S Series node to a Gen 2 VxRail 240F cluster the build fails.

What could be a possible cause of this situation?
A . IP Pool has no more free addresses
B . Hybrid and Flash nodes cannot be mixed in the same cluster
C . Quanta and Dell hardware cannot be mixed in the same cluster
D . Loudmouth process needs to be restarted

Answer: B