If f(x) is an even function, which statement about the graph of f(x) must be true?

Question

It has rotational symmetry about the origin.
It has line symmetry about the line y = x.
It has line symmetry about the y-axis.
It has line symmetry about the x-axis.

Answer 1

The statement that must be true about the graph of f(x) if it is an even function is: It has line symmetry about the y-axis.