How to minimize the drift in the value of resistance measured using a Wheatstone bridge?

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answerhappygod
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How to minimize the drift in the value of resistance measured using a Wheatstone bridge?

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a) by using a high precision null detector
b) by keeping the lead wire resistances within 0.2 mΩ
c) by using a e.m.f source of minimum value
d) by minimizing the flow of current
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