The number of secure Internet servers in the United States from 2009 to 2013 can be modeled by a quadratic function. The graph below approximates the number of secure internet servers, s, per 1 million people, for a given year, where trepresents the years since 2009. Which of the following functions best models the number of secure Internet servers in the United States per 1 million people between 2009 and 2013?

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