The ratio $(R)$ of output resistance $r_0$, and the input resistance $r_i$ in measurements of input and output characteristics of a transistor is typically in the range :

Question

$\begin{array}{1 1}(1) R \sim 10^2−10^3 \\ (2) R \sim 1−10 \\ (3) R \sim 0.1−0.01 \\(4) R \sim 0.1−1.0 \end{array}$