(1) if they are in either of the following situations:(a) they become able to hold an employment, perform work or assume the functions of an occupation from which they derive at least the same income that they derived from their employment, work or occupation before the health assessment referred to in paragraph 2 of section 43, subject to cases where they may continue to benefit from that financial assistance within the context of their vocational rehabilitation; or
(b) they are in none of the situations referred to in subparagraphs a to c of paragraph 1 of section 43 and become once again able to perform the majority of their usual activities;