Q.

The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

• A(C.O.P.)P = (C.O.P.)R + 2
• B(C.O.P.)P = (C.O.P.)R + 1
• C(C.O.P)P = (C.O.P)R – 1
• D(C.O.P)P = (C.O.P)R