You have a Mac Pro with an unknown firmware password How can you reset the password?

A.
Start up the Mac Pro from the Recovery volume and choose Reset Firmware Password from the Utilities menu.

B.
Start up the Mac Pro and click Enter Master Password at the login window. Enter the computer’s master password, and click Reset Firmware Password

C.
In System Preferences, click Start Up Disk, authenticate with an administrator account password, and click Reset Firmware Password

D.
Turn off the Mac Pro, open it and change the configuration of its physical memory modules, then close it and turn it on again.