a) Where the service of an individual in an educational institution described in Section 2915.1, or for an educational service agency, during the first of two successive years or academic terms, or prior to a vacation period or holiday recess is performed in any capacity, such individual shall be ineligible for benefits during the intervening period:

1. 1) Between two successive academic years; or,
2. 2) Between two regular terms, whether or not successive; or,
3. 3) On paid sabbatical leave provided in the individual's contract; or,
4. 4) During the period of an established and customary vacation period or holiday recess;