The accuracy of an Electronic Distance Measuring Instrument (EDMI) is specified as ±(a mm + b ppm). Which one of the following statements is correct?

a varies in proportion to the distance being measured and b remains constant.

Both a and b remain constant, irrespective of the distance being measured.

a remains constant and b varies in proportion to the distance being measured.

Both a and b vary is proportion to the distance being measured.

The accuracy of an Electronic Distance Measuring Instrument (EDMI) is

1.	The accuracy of an Electronic Distance Measuring Instrument (EDMI) is specified as ±(a mm + b ppm). Which one of the following statements is correct?
A.	Both a and b remain constant, irrespective of the distance being measured.
B.	a remains constant and b varies in proportion to the distance being measured.
C.	a varies in proportion to the distance being measured and b remains constant.
D.	Both a and b vary is proportion to the distance being measured.
Answer» C. a varies in proportion to the distance being measured and b remains constant.