(3A)[ The provisions of sub-rules (1) and (2A) shall apply for the assessment year 2017-18 and two assessment years immediately following that assessment year:Provided that where an eligible assessee is eligible to exercise option under sub-rule (2) or, as the case may be, sub-rule (2A) above, the assessee shall have the right to choose the option which is most beneficial to him.] [Sub-rule (3A) inserted by the Income-tax (Twelfth Amendment) Rules, 2017, w.r.e.f. 1-4-2017.]