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.) 

Answer options:

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.

C