Coordinate Geometry Progress Quiz #6 Qn 10

The solution for this question suggests that this is an even function while I selected neither even nor odd,

Greg mentions in the solution that x^-2 (for the c term) is an even term. However, in the prepswift video Even & Odd functions under Algebra Foundation the definition given is for only positive even exponents and 0,

image

Which is correct? Or am I missing something else here?

The quiz. This has been fixed.