Which extensions can drive installs of your mobile app?

The question above has multiple choices as follows.

a.       App extensions 

b.      Sitelink extensions

c.       Structured snippet extensions 

d.      RSLAs (remarketing lists for search ads)

The correct answer is (A) App extensions 

App extensions are a great way for people to access your website. They allow you to link to your tablet or mobile app from your text adds. If you want to drive app downloads, app promo ads might be the best option.

it could be e. idk for sure

well cos like a ds it doesn't really die out, unlike for example, fifa, they always come out with a new version, so lets say your fifa 18 is charging you to update the teams and stuff, so, if messi were to go to real madrid (never gonna happen) it would switch messi to the other team, until the owners of fifa come out with fifa 19, then the game would eventually stop updating, and back to the ds, it doesn't really stop working after sometime because there's lots of things that it could be used for, and idk if u know what i'm saying, but long story short, samsung, represents the ds, if they still work, and people love them but not the new version, the old version still works, so they don't really force people to buy new phones, get me?