7. Let f(x) = 2x3 - 70x - 9 and g(x) = 3x2 - 10x - 2. A composite function g o f o g(x) is formed. What is the value of g o f o g(4)? (A) -5； (B) -2； (C) 2；(D) 5.

複選題3. Suppose we have two functions fand g, withf(1)=3,f(2)=1,f(3)=4,f(4)=6, g(1)=5,g(2)=3,g(3) =4,g(4)=1,g(5) =3,and g(6) = 2. Which is the correct mapping of the composite function g o f? (A) go f(1) = 5； (B) go f(2) = 3； (C) go f(3) = 1； (D) g o f(4) = 6.