The SiRT feature is enabled on the RA in an SRDF/S configuration. When does the host
receive the acknowledgement of a write?

A.
When I/O is written to the cache at the R2 site and acknowledgement is received by the
R1 site from R2 site

B.
When I/O is written to R2 site cache but not acknowledged yet

C.
When I/O is written at R1 site cache and sent to the R2 site

D.
Immediately after the I/O is written to R1 cache