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A university will spend at most $4,500$ dollars to buy monitors and keyboards for a computer lab. Each monitor will cost $250$ dollars, and each keyboard will cost $50$ dollars.
Which inequality represents all possible combinations of $x$ , the number of monitors, and $y$ , the number of keyboards, the university can buy for the computer lab?

$250 x+50 y \leq 4,500$

$250 x+50 y< 4,500$

$50 x+250 y< 4,500$

$50 x+250 y \leq 4,500$

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