A cluster of vSphere 6.5 and 6.7 hosts all have identical hardware. VMs are created on the 6.7 hosts

Why are the VMs unable to migrate to the 6.5 hosts?

A. VMware Tools version is upgraded.

B. EVC mode is disabled.

C. DPM is configured incorrectly.

D. The virtual hardware version is incompatible with 6.5.