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Four cells of emf \( 1 \mathrm{~V}, 2 \mathrm{~V}, 3 \mathrm{~V} \) and \( 4 \mathrm{~V} \) are connected in parallel as shown. If their internal resistances are respectively \( 1 \Omega, 1 \Omega, 1 \Omega \) and \( 2 \Omega \), then the current through the external load resistance \( R \) is
(1) \( 2 \mathrm{~A} \)
(2) \( \frac{7}{2} \mathrm{~A} \)
(3) \( \frac{2}{7} \mathrm{~A} \)
(4) \( \frac{1}{4} \mathrm{~A} \)
\( \mathrm{P} \)
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