(1) You go to Greater's Ice Cream and see the price of a cone quoted as $3.00. (2) You buy the cone and pay with $3.00 in cash. In the first instance money serves as , while in the second instance money serves as . Choose one: A. a unit of account; a store of value B. a medium of exchange; a store of value C. a medium of exchange; a unit of account D. a store of value; a unit of account E. a unit of account; a medium of exchange F. a store of value; a medium of exchange