You can accept the default ESXi host version for this virtual machine or select a different version, depending on the hosts in your environment.
The default compatibility for this virtual machine is determined by the host on which the virtual machine is created or by the default compatibility settings on the host, cluster, or data center. You can select a different compatibility from the default.
Only host versions that are in your environment appear in the Compatible with drop-down menu. For information about choices and compatibility strategies, see Virtual Machine Compatibility.