Norton AntiVirus Scan Action Close versus Apply

After performing a Norton scan for viruses, Norton 360 you get 2 choices: "Close" versus "Apply".

For Each threat it says fully resolved so one would think you should be able to simply Close the app.

The other choice is to Apply. I would hope the program already applied the fix. I went to the Norton Help screen expecting a simple explanation but no.

It doesn't say why nor when you'd select Apply.

If I select Close, I would expect the threats were actually deleted or I wasted hours waiting for a full system scan!
The Help section needs to rewrite the explanation.