A Carnot device extracts 5.00 kJ of heat from a body at -10.0C. How much work is

Question:

A Carnot device extracts 5.00 kJ of heat from a body at -10.0°C. How much work is done if the device exhausts heat into the environment at?
(a) 25.0°C;
(b) 0.0°C;
(c) - 25.0°C; in each case, is the device acting as an engine or as a refrigerator?