Within a composite group, what happens to host writes for all devices when a Timefinder consistent split is performed?

A.
I/O from the host is paused for a default of 5 milliseconds for all devices within the composite group.

B.
/IO from the host is blocked until all devices in the composite group have completed their split operation

C.
I/O from the host is queued to internal server disk devices for all devices within the composite group.

D.
I/O from the host is stalled for all devices within the composite group until a restart command is issued