If a function \( f(x) \) is even, it means that the property \( f(-x) = f(x) \) holds for all \( x \). This indicates that the graph of the function is symmetric about the y-axis.
Based on this definition, the true statement would be:
The graph of f(x) is symmetric about the y-axis.
Therefore, the correct response from the provided options would be:
The graph of f of x is symmetric about the y-axis.