Given below are two statements, one labelled as Assertion (A) and the other labelled as **Reason (R):** Assertion (A):** A potentiometer is widely preferred over a standard voltmeter for measuring the true electromotive force (EMF) of a chemical cell. **Reason (R):** A potentiometer operates on the null-deflection method and draws no current from the cell at the balance point, whereas a voltmeter always draws some current, measuring terminal potential difference instead of true EMF. Choose the correct option:

Options:

• A: Both A and R are true and R is the correct explanation of A.
• B: Both A and R are true but R is not the correct explanation of A.
• C: A is true but R is false.
• D: A is false but R is true.

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