When a dimension is specified as \(\phi \;20_{ -0.010}^{ +0.020}\) mm, the tolerance provided is

When a dimension is specified as \(\phi \;20_{ -0.010}^{ +0.020}\) mm

1.	When a dimension is specified as \(\phi \;20_{ -0.010}^{ +0.020}\) mm, the tolerance provided is
A.	20 microns
B.	10 microns
C.	30 microns
D.	200 microns
Answer» D. 200 microns