Question For Those Who Use Blogger and Adsense

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I'm going to apply for Adsense today on Blogger. And on one of the questions on the app- it has where you can check the following: Adsense for Content and Adsense for Search I'm pretty sure I'll need to put a check by the one on Content. But what about the one for Search? Do I check that one too? What is that for? And one other question please. Should I apply as an "Individual" account or "Business" account? What's the difference? I am only an individual- but would like to put other affiliate ads on my page. Would I then have to apply as a "Business"? Or would thta still be okay under "Individual"? Any help is appreciated. Thanks.