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PA and PB are two tangents from a point P outside the circle with centre O. If A and B are points on the circle such that `angle APB = 128^@`, then `angle OAB` is equal to:
PA और PB, O केंद्र वाले वृत्त के बाहर एक बिंदु P से दो स्पर्शरेखा है । यदि A और B वृ पर बिंदु इस कार है की है `angle APB = 128^@`, तो `angle OAB` बराबर है:

A

`64^@`

B

`72^@`

C

`52^@`

D

`38^@`

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