The graph shows y as a function of x:
Graph of x against y shows 4 segments. Segment A is a horizontal line parallel to the x-axis. Segment B is a slanting straight line going down. Segment C is a slanting line going up. Segment D is a slanting straight line going down which touches the x-axis.
In which segment is the function constant? (5 points)
A
B
C
D