You need to verify whether the replica of VM5 on Server1 is functional

Your network contains two servers named Server1 and Server2 that run Windows Server 2012 R2.
Server1 and Server2 have the Hyper-V server role installed. Server1 and Server2 are configured as
Hyper-V replicas of each other.
Server2 hosts a virtual machine named VM5. VM5 is replicated to Server1.
You need to verify whether the replica of VM5 on Server1 is functional. The solution must ensure
that VM5 remains accessible to clients.
What should you do from Hyper-V Manager?

A.
On Server1, execute a Planned Failover.

B.
On Server1, execute a Test Failover.

C.
On Server2, execute a Planned Failover.

D.
On Server2, execute a Test Failover.

Explanation:
Test Failover (TFO) is an operation initiated on your replica virtual machine (in this scenario on
Server1) which allows you to test the sanity of the virtualized workload without interrupting your
production workload or ongoing replication.
TFO is performed on the replica virtual machine by right-clicking on the VM and choosing the Test
Failover operation (either from the Hyper-V Manager or from the Failover Clustering Manager).

Types of failover operations in Hyper-V Replica – Part I – Test Failover.