Section 3(2)(a) in Customs (Advance Rulings) Rules, 2002
(a)in the case of an individual, by the individual himself, or where the individual is absent from India, by the individual concerned or by some person duly authorized by him in this behalf; and where the individual is a minor or is mentally incapacitated from attending to his affairs, by his guardian or by any other person competent to act on his behalf;