How does a Data Loss Prevention $($DLP$)$ system prevent data exfiltration?

Question $20$ options:

Protected data is allowed to leave the network but security personnel are alerted.

Protected data is allowed to leave the network but the originator of the data is alerted.

When protected data is attempting to exit the network, the network traffic is blocked.

When protected data is attempting to exit the network, the originator of the data is asked if it is ok$.$