(a) If the service performed during one-half or more of a pay period by an individual for an employing unit constitutes employment, all the service of the individual for the period is considered employment.
(b) If the service performed during more than one-half of a pay period by an individual for an employing unit does not constitute employment, then none of the service of the individual for the period is considered employment.
(c) In this section, “pay period” means a period of not more than 31 consecutive days for which a payment for service is ordinarily made to the individual by the employing unit. This section does not apply to service performed in a pay period by an individual for an employing unit when any of the service is excluded because it is subject to an unemployment insurance program established by an Act of Congress.