The function f shows mobile data growth in the United States from 2012 to 2017. The first function value, f(2012), represents the number of petabytes per month of mobile data traffic used in the United States in the year 2012. Petabytes per Month 4000 3000 2000 1000 Year 2011 2012 2013 2014 2015 2016 2017 Which conclusion can be drawn based on this graph? O In the United States in 2015, 1,000 petabytes per month were used for mobile data traffic. In the United States in 2017, 2,000 petabytes per month were used for mobile data traffic. O In the United States in 2014, less than 500 petabytes per month were used for mobile data traffic. In the United States in 2012, over 500 petabytes per month were used for mobile data traffic.