If a candidate challenges the answer key and his claim. is justified then the original answer key will modified accordingly. Therefore everybody who choose the option will be awarded marks. For example if the answer key says the answer for Q5 is A, but a student claims it is also D, and his claim is justified, then the official answer key will have both A and D as the answer for Q5. The person who challenges will be refunded with this fee for challenging if his claim is justified, but the marks will be given for all. Hope this helps.

All the best!!!