Which is NOT a polynomial?
A4/x^4 + 3/x^3− 2/x^2 −1
Bx^5 − 5x^4 + 4x^3 −3x^2
C3x^2 + 5x^4 + 2x − 12
Dx^3− 7x^2 + 9x −20
A4/x^4 + 3/x^3− 2/x^2 −1
Bx^5 − 5x^4 + 4x^3 −3x^2
C3x^2 + 5x^4 + 2x − 12
Dx^3− 7x^2 + 9x −20