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Given below are two statements: one is labelled as Assertion \( \mathbf{A} \) and the other is labelled as Reason \( \mathbf{R} \).

Assertion A: Alloys such as constantan and manganin are used in making standard resistance coils.

Reason R: Constantan and manganin have very small value of temperature coefficient of resistance.

In the light of the above statements, choose the correct answer from the options given below.
(a) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true and \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \)
(b) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true but \( \mathrm{R} \) is NOT the correct explanation of A
(c) \( \mathrm{A} \) is true but \( \mathrm{R} \) is false
(d) \( \mathrm{A} \) is false but \( \mathrm{R} \) is true
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