A Zener diode when used as a voltage regulator, is connected (a) in forward bias. (b) in reverse bias.(c) in parallel to the load.(d) in series to the load. A. (a) and (b) are correctB. (b) and (c) are correctC. Only (a) is correctD. Only (d) is correct

When a Zener diode is used as a voltage regulator, it is typically connected in reverse bias. This means that option (b) "in reverse bias" is correct.

A Zener diode is connected in parallel to the load. This is because the Zener diode should maintain a constant voltage across its terminals regardless of variations in the load current. So, option (c) "in parallel to the load" is also correct.

Therefore, the correct answer is (B) " (b) and (c) are correct."