Which two options are requirements to perform a migration between vCenter Server instances? (Choose two.)

Which two options are requirements to perform a migration between vCenter Server instances? (Choose two.)
A . The vCenter Server servers must be time-synchronized.
B . The ESXi hosts must be version 5.5 or later.
C . The vCenter Servers must be version 6.0 or later.
D . The vCenter Server must be in the same single Sign-On domain.
E . The ESXi hosts must have vSphere Standard, Advanced, or Enterprise Plus licensing.

Answer: A,C