A zener of power rating \( 1 \mathrm{~W} \) is to be used as a voltage regulator. If zener has a...

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A zener of power rating \( 1 \mathrm{~W} \) is to be used as a voltage regulator. If zener has a breakdown of \( 5 \mathrm{~V} \) and it has to regulate voltage which fluctuated between \( 3 \mathrm{~V} \) and \( 7 \mathrm{~V} \), what should be the value of \( R_{s} \) for safe operation?
(a) \( 20 \Omega \)
(b) \( 30 \Omega \)
(c) \( 40 \Omega \)
(d) \( 50 \Omega \)
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