**Answer the following question based on the information given below.**

Given below is a graph made up of straight-line segments shown as thick lines. Choose the answer as

- if $f(x) = 3 f(–x);$
- if $f(x) = –f(–x);$
- if $f(x) = f(–x);$ and
- if $3 f(x) = 6 f(–x),$ for $x\geq 0.$

- $1$
- $2$
- $3$
- $4$