Any penetration tester's activities and applications used during conducting penetration testing easily leave behind evidence on a system will reveal the mischief that they have been performing. The penetration testers need to make sure their activities remain secret and hidden as long as possible at least until meeting with the client to give them a report on the results of the penetration test. a) Justify your reasons why penetration testers hide their tracks? [2M] b) Briefly elaborate the methods penetration testers used to evade antivirus. [BM] c) Password-cracking and process-hiding backdoor are two types of backdoor that [2M] can be used in evading defenses. Briefly discuss each of them.