What was the age of Rasool Ullah (P.B.U.H) at the time of First Wahi?

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What was the age of Rasool Ullah (P.B.U.H) at the time of First Wahi?

A. 40 Years 6 months
B. 40 Years 8 months
C. 40 Years 10 months
D. 40 Years 11 months