Which exponential function is represented by the graph?
A
f of x is equal to 2 times open paren 3 to the x th power close parenB
f of x is equal to 3 times open paren 2 to the x th power close parenC
f of x is equal to 3 times open paren 3 to the x th power close parenD
f of x is equal to 2 times open paren 2 to the x th power close paren