How do I know if I have activated Diablo 3 already or not?

Question

when I install Diablo 3 it tells me:

"Create or manage a Battle.net account

Before playing, you must visit Battle.net account management and activate Diablo III. This process is very quick, and the installation will continue in the background"

It gives me these two options:

Activate Diablo III

I've Already Activated

How do I know which one to choose? If I played in Beta, does it mean I've already activated?

Answer 1

Just click on "Activate Game" and it will take you to the Battle.net page. Click on "Account" on the top right corrner and see what it says under "Your Game Accounts". It should show something like "Diablo III Standard Edition". If you don't see it there, just click on "Add a Game" and put in your game key