Final answer:
Refer to figure, drawing X only correctly shows a light that is controlled from two locations (two-3 ways) (Option D).
Step-by-step explanation:
In this question, we are dealing with a circuit controlled from two locations, commonly referred to as two 3-way switches. Each switch has three terminals, and the light can be turned on or off from either of the switches. The answer options provided describe the positions of the switches and what happens when each switch is flipped.
- Y & Z only - This means that both switches Y and Z are in the 'ON' position, while switch X is in the 'OFF' position.
- X & Y only - This means that switch X is in the 'ON' position, while switch Y is in the 'OFF' position.
- Y only and Z only - This means that switch Y is in the 'ON' position and also switch X.
- X only - This means that switch X is in the 'OFF' position.
Thus, the correct option is D.
Your question is incomplete, but most probably your full question can be seen in the attachment.