The diameter of a metal rod is measured as 23.40 cm to four significant figures. What is the maximum error in the measurement?

A.
0.05cm 
B.
0.5cm 
C.
0.045cm 
D.
0.005cm 
E.
0.004cm
Correct Answer: Option D
Explanation
Maximum error in measurement to 2 decimal places
Maximum error = (frac{1}{2}) x 0.001
= 0.005