(1)For the purposes of exercise of the option for safe harbour, the assessee shall furnish a Form 3CEFA, complete in all respects, to the Assessing Officer on or before the due date specified in Explanation 2 below sub-section (1) of section 139 for furnishing the return of income for-(i)the relevant assessment year, in case the option is exercised only for that assessment year; or(ii)the first of the assessment years, in case the option is exercised for more than one assessment year:Provided that the return of income for the relevant assessment year or the first of the relevant assessment years, as the case may be, is furnished by the assessee on or before the date of furnishing of Form 3CEFA.