Which of the following are characteristics of a rootkit?

A$.$

Collects various types of personal information$/$ Requires administrator level privileges for installation

B$.$

Resides below regular antivirus software detection$/$ Requires administrator level privileges for installation

C$.$

Monitors user actions and opens pop$-$ups based on user preferences$/$ Requires administrator level privileges for installation

D$.$

Requires administrator level privileges for installation$/$ can replicate from nothing