Circular arc on a part profile is being machined on a vertical CNC milling machine. CNC part program using metric units with absolute dimensions is listed below:---------------------------------------N60 G01 X 30 Y 55 Z – 5 F50N70 G02 X 50 Y 35 R 20N80 G01 Z 5---------------------------------------The coordinates of the centre of the circular arc are:

• A. (30, 55)
• B. (50, 55)
• C. (50, 35)
• D. (30, 35)