You need to set the custom resource property for each of your Exchange Server 2007 resource mailboxes so that training organizers will be able to view whether a projector is present in a given training room. What should you do before you can set the custom resource properties?

A.
Create a resource mailbox for each projector as type Equipment and assign this resource mailbox as a delegate for each training-room resource mailbox

B.
Run the Set-Mailbox -ResourceCapacity 10 cmdlet for each training-room resource mailbox

C.
Run the Set-ResourceConfig -ResourcePropertySchema “Room/Projector” cmdlet

D.
Run the Set-ResourceConfig -ResourcePropertySchema “Equipment/Projector” cmdlet