Quantitative Aptitude Geometry Co-ordinate Geometry

What is the angle made by the line joining A (5, 2) and B (6, -15) at O (0, 0)?

1
\(\frac{\pi}{ 2 }\)
2
\(\frac{\pi}{4 }\)
3
\(\frac{\pi}{ 6}\)
4
\(\frac{\pi}{ 3 }\)

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