Your penetration testing team installs an in-line hardware key logger onto one of your network...

 Explanation:

In-line hardware keyloggers are physical devices placed between a keyboard and a computer.

They are a concern because they are not detectable by software-based monitoring tools, posing a significant risk to the confidentiality of sensitive information.

 Why Other Options Are Incorrect:

A. Don’t require physical access: Physical access is required to install the hardware.

B. Don’t comply with regulations: While true, this is a secondary concern compared to their undetectability.

D. Are relatively inexpensive: Cost is a factor but not the primary security concern.

 EC-Council CISO Reference:

The curriculum addresses the risks posed by hardware-based attacks and the need for physical security controls to mitigate such threats.