
In this problem, we are asked to match the circuit names from List-I with their corresponding diagrams in List-II. Let's analyze the circuits in List-I and compare them with the provided diagrams in List-II.
The correct matching is:
A - II, B - III, C - IV, D - I
In the circuit shown, assume that the BJT in the circuit has very high $\beta$ and $V_{BE} = 0.7$ V, and the Zener diode has $V_Z = 4.7$ V. The current $I$ through the LED is ________ mA (rounded off to two decimal places).

