Which of the following statement about snooping is true?

It occurs when an unauthorized user tries to log on repeatedly to a computer or network by guessing usernames and passwords.

It is an activity of observing the content that appears on a computer monitor or watching what a user is typing.

It is a technique that makes a transmission appear to have come from an authentic source by forging the IP address.

It is the art of convincing people and making them disclose useful information such as account names and passwords.