Which step is required when adding an existing hard disk that is configured as a boot disk during virtual machine creation? (Choose the best answer.)

Which step is required when adding an existing hard disk that is configured as a boot disk during virtual machine creation? (Choose the best answer.)
A . Enable Secure Boot.
B . Select ‘RDM Disk’ from the ‘Add New Device’ drop-down menu.
C . Remove the existing disk before adding the boot disk.
D . Set the boot delay to at least 5,000 milliseconds.

Answer: C

Explanation: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vm_admin.doc/GUID-79116E5D-22B3-4E84-86DF-49A8D16E7AF2.html#GUID-79116E5D-22B3-4E84-86DF-49A8D16E7AF2