Assertion (A): The axis of an NC drilling machine spindle is denoted as z - axis.
Reason (R): In NC machine tool, the axis perpendicular to both x- and y - axes is designated as z - axis.
Option (A)
Both A and Rare true and R is the correct explanation of A
Option (B)
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A is false but R is true
Correct Option: