A person who wishes to become a voluntary contributor under section 24 of the Act of 2005 shall elect to become a voluntary contributor -

(a) from the beginning of the contribution week following that in which he or she ceased to be an employed contributor

(b) from the beginning of any contribution year where the voluntary contribution relates to a contribution year within sixty months after the end of the contribution year in which he or she ceased to be an employed contributor,

(c) from the beginning of the contribution week following that in which employment contributions were last credited to him or her in accordance with the provisions of these Regulations,

(d) from the beginning of any contribution year where the voluntary contribution relates to a contribution year within sixty months after the end of the contribution year in which employment contributions were last credited to him or her in accordance with the provisions of these Regulations,