When Hijra started?

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(a) 12th Rabi-ul-Awwal of 13th year of
Nabawat
(b) 12th Rabi-ul-Awwal of 12th year of
Nabawat
(c) 12th Rabi-ul-Awwal of 14th year of
Nabawat
(d) 12th Rabi-ul-Awwal of 10th year of
Nabawat

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