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Gilbert has 50 drywall screws. He is purchasing more screws. He can purchase up to 6 boxes of screws. Each box of screws contains 200 screws. He can't purchase partial boxes. The function that models the number screws Gilbert has is f(b)=200b+50 , where b is the number of boxes he purchases.

What is the practical domain of the function?

•all real numbers from 1 to 6 inclusive

•{250,450,650,850,1050,1300}

•all real numbers

•all integers from 1 to 6 inclusive