1. What is rootkit? (a) Malicious Code that user and system administrator is aware of (b) Malicious Code that user and system administrator is not aware of (c) Malicious code that is written by user and system administrator (d) None of the above 2. True or False Kernel level rootkit achieves stealthy behavior by manipulating the control flow of system level call 3. Which one is not a known type of rootkit?| (a) Hardware level rootkit (b) Application level rootkit (c) Kernel level rootkit (d) Monitor level rootkit