Nicholas needs to decide between buying a slate pool table for $$1,800$ or being able to go on a New York vacation for $$1,000$ and still having enough left over to buy a nonslate pool table for $$800.$ Nicholas opts for the nonslate pool table and the New York vacation. Nicholas has used money in what ways in making his decision?

A$.$ Medium of exchange and a standard unit of account.

B$.$ Medium of exchange and a method to decrease deferred payments.

C$.$ Medium of exchange and a store of value.

D$.$ Store of value and a standard unit of account.