An individual described in this subparagraph with respect to a month is an individual who establishes to the satisfaction of the Secretary that, as of the last day of the previous month, the individual—
(i)#
had at least 30 quarters of coverage under subchapter II;
(ii)#
was married (and had been married for the previous 1-year period) to an individual who had at least 30 quarters of coverage under such subchapter;
(iii)#
had been married to an individual for a period of at least 1 year (at the time of such individual’s death) if at such time the individual had at least 30 quarters of coverage under such subchapter; or
(iv)#
is divorced from an individual and had been married to the individual for a period of at least 10 years (at the time of the divorce) if at such time the individual had at least 30 quarters of coverage under such subchapter.