In this Act, unless the context otherwise requires,-

(a). "advance ruling" means a decision provided by the Authority or the Appellate Authority or the National Appellate Authority to an applicant on matters or on questions specified in sub-section (2) of section 97 or sub-section (1) of section 100 or of section 101C, in relation to the supply of goods or services or both being undertaken or proposed to be undertaken by the applicant;