(a) (a) This is the most positive approach to the situation. The very fact that you are open to an enquiry being conducted on the matter proves that you are honest. It reveals your willingness to cooperate with the authorities. Only a courageous person will be willing to undergo such a painful process.
(b) This is a negative option. Your asking for another person to be appointed that means your are being cowardly. You are seeking escape.
(c) If you ignore the allegations you are trying to escape the facts. The rumble will then become a roar one day. It is being cowardly and dishonest to yourself.
(d) If you stop undertaking any initiative till the matter is resolved it means you are over-reacting to the allegations. If that is the case then people will take advantage of the situation by making more such allegations.