A and B are two distinct points on circle O, such that the central angle AOB measures 72 degrees. The radius of the circle is r. The perimeter of sector AOB consists of line segments AO and BO and arc AB. Which of the following expression gives the perimeter of sector AOB in terms of r?
(A) (π + 10) · r / 5
(B) (π + 8) · r / 4
(C) (π + 6) · r / 3
(D) (π + 2) · r / 5
(E) (2π + 10) · r / 5



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rephrased to avoid giving figure