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.