The following table shows the number of cell phone subscriptions in a country in billions for selected years x after 2005. 2009 2006 1.5 9.3 X y 2005 0.4 2007 4.3 2008 7.5 (a) Find a function C(x) that models the data, where x is years after 2005. (b) Predict the number of cell phone subscriptions in 2012. 2010 9.9 (a) Select the correct choice below and fill in the answer boxes within your choice. (Round to two decimal places as needed.) OA. The best model for the data is a logarithmic function and is given by f(x) a OB. The best model for the data is a logistic function and is given by f(x) = - 1+ OC. The best model for the data is an exponential function and is given by f(x) = In x. BLIX

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