In meter bridge experiment the observation table and circuit diagram are shown in figure
`{:(SNO,R(Omega),l(cm)),(1,1000,60cm),(2,100,13cm),(3,10,1.5cm),(4,1,1.0cm):}`
Which of the following readings is not taken correctly?
A. `1`
B. `2`
C. `3`
D. `4`