Determine the output current for an n-bit weighted resistor DAC?

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a) (VR/R )× (do/2 +d1/22 + ……dn/2n)
b) (VR/R )× (d1/21 +d2/22 + ……dn/2n)
c) (VR/R )× (d02/2 +d12/22 + ……dn2/2n)
d) None of the mentioned