Using the diagram in Figure 18.2. Which of the following conditions occu...

Using the diagram in Figure 18.2.

Which of the following conditions occurs when the defrost relay is energized if the defrost thermostat is closed?

a. the reversing-valve solenoid is energized

b. a connection is made between R and W2 in the defrost board

c. the outdoor fan motor is de-energized

d. all of the above