You have just booked a catered function to be held in three months. You inform your client of the guarantee clause which:

A$.$ requires them to give the hotel a "minimum" count of the expected attendance prior to the function.

B$.$ guarantees the sizes of drinks and proper payments in a beverage plan.

C$.$ upgrades the meeting room should space become available.

D$.$ holds the function room for the entire evening should the event run longer than expected.