According to Norton’s theorem, the expression for load current. is-

Correct option is C

According to Norton's theorem, the equation for load current:

​$$I_L = I_{SC} \times \frac{R_{int}}{R_{int} + R_L}$$

By Norton’s theorem, any linear circuit consisting of multiple power sources and resistors can be replaced by a constant current source in parallel with a single resistor.

​$$V_{th} = I_N \times R_N$$, $$R_{th} = R_N$$

$$I_N = \frac{V_{th}}{R_{th}}$$, $$R_N = R_{th}$$​​​