The unit of conductance(G) is

The correct answer is Option (3) → $ohm^{-1}$

Conductance (G) is the reciprocal of resistance (R):

$G = \frac{1}{R}$​

Resistance R has units of ohm (Ω).

Therefore, conductance G has units of $ohm^{-1}$, also called siemens (S).