Consider the following statements: DC potentiometer is the

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Consider the following statements: DC potentiometer is the best means available for measurement of dc voltages because
1. The precision in measurement is independent of the type of detector used.
2. It is based on null-balance technique.
3. It is possible to standardize before a measurement is undertaken
4. It is possible to measure dc voltages ranging in value from millivolts to hundreds of volts. Of these statements:

1. 2 and 3 are correct
2. 1 and 4 are correct
3. 2 and 4 are correct
4. 3 and 4 are correct

Correct Option: A

NA