Any code that is designed to hide the existence of processes and privileges is referred to as a(n)

Any code that is designed to hide the existence of processes and privileges is referred to as Rootkit.   This is a software that is specifically designed to gain access or damage a computer without the knowledge of the owner.  It is an undercover type of malware that is aimed to hide its existence on your computer, so as to allow it or another malicious process to access your computer.

4because of my mind tells me to pick 4