Let p be a function whose graph contains the following consecutive line segments:
• From x=−3 to x=−1, the graph is a straight line passing through (−3,1) and (−1,4).
• From x=−1 to x=2, the graph is horizontal at y=4.
Determine p′(0).
a) 23
b) Undefined
c) 53
d) 0