; (II) on January 1 of the calendar year in which occurred the applicable eligibility date with respect to such individual, such putative individual were fully insured, attained retirement age (as defined in section 216(l)(2)) and were otherwise eligible for, and applied for, old-age insurance benefits; and (III) such putative individual’s average indexed monthly earnings taken into account in determining such primary insurance amount were equal to 1/12 of the national average wage index (as defined in section 209(k)(1)) for the second year prior to such calendar year. (ii) (I) In the case of a monthly insurance benefit under subsection (b) or (c), the full increase amount determined under this subparagraph shall be one-half the amount determined under clause (i); or (II) in the case of a monthly insurance benefit under subsection (d), (g), or (h), the full increase amount determined under this subparagraph shall be the percentage of the amount determined under clause (i) equal to the ratio which the amount of such benefit bears to the primary insurance amount (before the application of section 203(a)) of the individual on whose wages and self-employment income the monthly insurance benefit is based. (4) In the case of a qualified beneficiary who is entitled to two or more monthly insurance benefits under this title for the same month— (A) the earliest applicable date of eligibility for such beneficiary with respect to such benefits shall be treated as the applicable date of eligibility for such beneficiary for the purposes of this subsection