What is the definition of asinchronous replication?

A.
Does not require acknowledged copy of data on primary and secondary storage before the write is acknowledged to the host.

B.
requires acknowledged write of data on primary storage only and data is forwarded to secondary site as network capabilities permit

C.
Requires acknowledged write of data on primary and secondary storage before the write is acknowledged to the host.

D.
Does not require acknowledged write of data on primary storage before data is forwarded to secondary site as network capabilities permit