When does data get copied from the source to the target device in a copy on first access (COFA)
pointer-based full-volume replication?

A.
Write I/O is issued to the source device
Read or write I/O is issued on the target for the first time

B.
Read I/O is issued to the source device
Write I/O is issued on the target for the first time

C.
Read or write I/O is issued to the source device
Read I/O is issued on the target for the first time

D.
Read or write I/O is issued to the source device
Read or write I/O is issued on the target for the first time

Explanation: