Let V and I be the readings of the voltmeter and the ammeter respectively as shown in the figure. Let `R_(V) " and "R_(A)` be their corresponding resistancce Therefore,
A. `R=V/I`
B. `R=V/(I-(V/R_(V)))`
C. `R=R_(V)-R_(A)`
D. `R=(V(R+R_(A)))/(IR_(A))`