If an investigator needs to communicate with another investigator but does not want the criminal to be able to eavesdrop on this conversation, what type of communication should be used?

A.
Digitally signed messages

B.
Out-of-band messages

C.
Forensics frequency

D.
Authentication and access control

Explanation:
B: Out-of-band communication means to communicate through some other type of communication channel. For example, if law enforcement agents are investigating a crime on a network, they should not share information through e-mail that passes along this network. The criminal may still have sniffers installed and thus be able to access this data.