11. An applicant is released from the undertaking referred to in regulation 3(2)—
(a)at the moment he first receives a retirement pension; or
(b)if he is prevented from continuing to discharge that undertaking by reason of any material circumstances beyond his control; or
(c)if he ceases farming and at least 3 hectares of his eligible land, or the eligible land used by him for the grazing of animals, continues to be used for agricultural purposes.