Answer:
D
Explanation:
This is a piece wise function. A piece wise function is a function which has several functions over specific intervals. This function has horizontal lines at y = -1, y = -2 and y = -3. This means only the graphs for B and D are possible solutions as A and C are above the x-axis. The graph for option B is reversed since y = -1 is over interval (0,1] instead of [-1,0). Answer choice D is correct.