Which statement is correct regarding Media Redundancy Protocol (MRP) in a ring of ProfiNET devices?

A.
When a link fault is detected, MRP rings must converge in less than 100 milliseconds

B.
MRP defines two device roles, Media Redundancy Master and Media Redundancy Client

C.
MRP can support rings of up to 250 devices

D.
MRP is only supported on network switches