Which statement best describes how to determine whether f(x)=9-4x^2 is an odd function

If you want to know if a function is odd, you look at the exponents/degrees it has; if they're all even it's an even function if they're all odd it's an odd function if it has a mix of both even and odd its neither
the function 9-4x^2 only has one x with an exponent of two making it even