QUICK HELP PLSSS Which rule defines the function in the graph?

The graph with X-coordinate marks -4, -2, 0, 2, 4 and Y-coordinate mark -4, -2, -1, 0, 2 and 4. There are 2 key features. The first key feature has head at (2, 2) and tail at (0, 0). The second key feature has head at (4, 2) and tail at (2, 0).