Woody, could I suggest that if you ask a question in future you give the full question. As posed “find the most suitable device to provide earth fault protection of the internal wiring of an individual fluorescent light fitting” is a nonsensical question.
Also state that it is homework. For homework questions you’ll find answers are in short supply unless you make an attempt to answer your question first.
The idea of homework is for you to find the answerers unaided, it teaches you both the subject and how to research answers. The best answer was given by Simon “get a copy of BS7671”. Many of questions posed at college will be based on it.