service not in the course of the employer’s trade or business performed in any calendar quarter by an employee, unless the cash remuneration paid for such service is $50 or more and such service is performed by an individual who is regularly employed by such employer to perform such service. For purposes of this paragraph, an individual shall be deemed to be regularly employed by an employer during a calendar quarter only if—

(A) on each of some 24 days during such quarter such individual performs for such employer for some portion of the day service not in the course of the employer’s trade or business, or

(B) such individual was regularly employed (as determined under subparagraph (A)) by such employer in the performance of such service during the preceding calendar quarter;