For a single asynchronous replication session, what does Unity automatically create?

For a single asynchronous replication session, what does Unity automatically create?
A . Two write intent logs: one on the source, one on the destination
B . Two internal snapshots: one on the source, one on the destination
C . Four internal snapshots: two on the source, two on the destination
D . Four write intent logs: two on the source, two on the destination

Answer: C