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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:

$\begin{array}{} \hline N60& G01 & X & 30 & Y & 55 & Z & -5& F50 \\ N70& G02& X& 50 & Y & 35 & R & 20 \\ N80 & G01 & Z & 5 \\ \hline \end{array}$

The coordinates of the centre of the circular arc are:

- $(30, 55)$
- $(50, 55)$
- $(50, 35)$
- $(30, 35)$