A refrigerator operates for a certain time, and the work done by the electrical energy during this

Question:

A refrigerator operates for a certain time, and the work done by the electrical energy during this time is W = 1000 J. What can be said about the heat delivered to the room containing the refrigerator?
(a) The heat delivered to the room is less than 1000 J.
(b) The heat delivered to the room is equal to 1000 J.
(c) The heat delivered to the room is greater than 1000 J.