The Gasket Surface of a Cylinder Head, as Measured with a Precision

The gasket surface of a cylinder head, as measured with a precision straightedge, should have a maximum variation of ________.

A) 0.001 inch in any 6-inch length or 0.004 inch overall
B) 0.004 inch in any 10-inch length or 0.008 inch overall
C) 0.002 inch in any 6-inch length or 0.004 inch overall
D) 0.020 inch in any 10-inch length or 0.020 inch overall