A rectangle PQRS is inscribed in a circle. One side of the rectangle, SR is 12cm and another side QR is 4√3 cm. What is the length of the minor arc QR?

A \( \frac{4 p \sqrt{3}}{3} \)

B \( \frac{2 p \sqrt{3}}{3} \)

C \( \frac{3 p \sqrt{3}}{4} \)

D \( \frac{8 p \sqrt{3}}{3} \)

E Cannot be determined

Correct Answer: Option A