Which of the following would not be a possible function for f (x) and g(x) such that f of g of x is equal to 8 over the quantity x squared end quantity plus 4 a f of x is equal to 8 over the quantity x squared end quantity plus 4 and g(x) = x b f of x is equal to 4 over x plus 4 and g of x is equal to x squared over 2 c f of x is equal to 8 over x plus 4 and g(x) = x2 d f of x is equal to 8 over x plus 4 and g of x is equal to 1 over the quantity x squared end quantity