Read the following context and choose the best option to answer the question.
Context: Partially also because I can study more when I do n't have classes to go to , but mainly because I want to just take my own time doing my study and revision , chill out and enjoy the weather that is gradually warming up . We had a go at a few table games at Skycity Queenstown and it was enjoyable . It was n't too different from dealing the games ... . you just know when the dealer is going to have a Blackjack when he had the Ace to begin with , and taking insurance does n't mean you 'd be any better off ... .
Question: Why did I know when the dealer had an ace ?
Options: 
- I did n't have any classes to go to .
 - I took insurance with me to be better off .
 - I enjoyed the warm weather .
 - I dealed blackjack in the past .


I dealed blackjack in the past .