Which function has a horizontal asymptote of y is equal to 3 ?
A
f of x is equal to 3 times open paren 2 to the x th power close parenB
f of x is equal to 2 times open paren 3 to the x th power close parenC
f of x is equal to 2 times 4 raised to the x minus 3 powerD
f of x is equal to 2 times open paren 4 to the x th power close paren plus 3