l. 1'i'i.-"hiI::h of the following statements is (are) CORRECT ab out opportunity cost? (a) If you buy a cup of coffee for $5, the opportunity cost of the coffee is a less expensive cup of tea. (1:) If you have more income than you can spend in your lifetime, you have no opportunity cost. (o) If you spend an hour studying instead of sleeping| the opportunity cost is the sleep you have given up. (d) All of the answers are correct