When is the water coil in a water source heat pump the acting evaporator?

When is the water coil in a water source heat pump the acting evaporator?
 
  A) in the cooling cycle B) in the heating cycle
  C) in the defrost cycle D) only when the unit is operating

 Q. 2

A water-source heat pump does not require a defrost cycle because
 
  A) it uses buried loops in which water is circulated, and the heat is then extracted from the water.
  B) there are no check valves or extra metering devices within a water-source heat pump.
  C) the fluid circulating through the water-source unit cannot be allowed to freeze.
  D) most water-source units use a single bi-flow thermostatic expansion valve.

 Q. 3

In a dual-fuel heat pump, what operates when second stage heat calls?
 
  A) the electric heat strips are energized to supplement the furnace
  B) the heat pump starts and the furnace shuts off
  C) both the heat pump and the furnace operate
  D) the furnace starts and the heat pump shuts off