The term "eavesdropping" refers to:

The term "eavesdropping" encompasses several methods of secretly listening to private conversations or obtaining information without the consent of the individuals involved. Both wiretapping and bugging are commonly recognized forms of eavesdropping.

Wiretapping involves intercepting telephone communications, capturing audio signals, or tapping into telephone lines to listen in on conversations. This method allows someone to access private discussions for various purposes, including surveillance or intelligence gathering.

Bugging refers to placing hidden microphones or recording devices in strategic locations to capture audio. This can occur in offices, homes, or other settings where conversations may take place, effectively allowing a third party to listen in without detection.

In contrast, trash cover involves sifting through someone's discarded materials to find sensitive information, which does not necessarily fall under the same concept as eavesdropping since it does not involve listening to conversations directly.

Thus, the correct understanding of eavesdropping includes both wiretapping and bugging, making the choice reflecting both of these methods the accurate one.