For each of the following scenarios, determine whether money is being used as a medium of account, store of value, or unit of account. a. Sam gives the grocery store clerk a $5 bill to pay for his purchase. multiple choice 1 Store of value Medium of exchange Unit of account b. Bill looks at the $20 price tag on a clock to see how much money he would need to purchase it. multiple choice 2 Medium of exchange Store of value Unit of account c. Maria writes a check to pay her electric bill. multiple choice 3 Medium of exchange Unit of account Store of value d. Susan transfers some of her wealth from her checking account into a certificate of deposit that earns interest. multiple choice 4 Medium of exchange Unit of account Store of value