John works as a professional Ethical Hacker. He is assigned a project to test the security of www.weare-secure.com. He i

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John works as a professional Ethical Hacker. He is assigned a project to test the security of www.weare-secure.com. He installs a rootkit on the Linux server of the We-are-secure network. Which of the following statements are true about rootkits?
Each correct answer represents a complete solution. Choose all that apply.

A. They allow an attacker to conduct a buffer overflow.
B. They allow an attacker to replace utility programs that can be used to detect the attacker's activity.
C. They allow an attacker to set a Trojan in the operating system and thus open a backdoor for anytime access.
D. They allow an attacker to run packet sniffers secretly to capture passwords.