A customer complained about their network performance. You scheduled a change request that will reroute their traffic through a different node to improve performance. What must you do to verify that this change had the desired results?

A.
Validate the customerSLA for performance through the network.

B.
Collect baseline performance data before and after the change.

C.
Contact the customer to ensure that their performance has improved

D.
Document the change request so that there is an audit trail.