On a Network, S1 Is Configured as the Primary Server

Multiple Choice

On a network, S1 is configured as the primary server, and S2 hosts a secondary DNS zone for the Active Directory domain. David configures S1 to allow zone transfer to S2, and he configures S2 with the default zone transfer settings. When the domain users report that they are unable to access certain hosts by name, David decides to use System monitor on S2. What should he do to make sure S2 is receiving zone transfers from S1?

A) Monitor the AXFR Request Received counter.
B) Monitor the AXFR Success Received counter.
C) Monitor the IXFR Request Received counter.
D) Monitor the IXFR Success Received counter.