Aboolean search can you narrow down your topic by doing what

a( finding the most popular topic for you to research

b( allowing you to restrict your search to look only for specific terms or groups of terms

c(avoid searching for him popular topics

d( searching the topic and all related topics

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?

answer; certification; plz check first, i believe this is correct. good luck;