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Consider a simple circuit shown in Fig. stands for a variable resistance \( R^{\prime} \). R' can vary from \( R_{0} \) to infinity. \( r \) is internal resistance of the battery \( \left(r \llRR_{0}\right) \).
(a) Potential drop across \( \mathrm{AB} \) is nearly constant as \( R^{\prime} \) is varied.
(b) Current through \( R^{\prime} \) is nearly a constant as \( R^{\prime} \) is varied.
(c) Current I depends sensitively on \( R^{\prime} \).
(d) \( I \geq \frac{V}{r+R} \) always.
Choose the correct option which is based on above statements.
(1) (a) and (b) only
(2) (b) and (c) only
(3) (a), (b) and (c) only
(4) (a) and (d) only
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