(a) Sketch the graph of a continuous function such that the intervals where it's increasing/docrossing and the intervals where it's concave up/down are as follows:(b) Sane in part (a) but now the intervals are the following: Increwing =(-,-1][1,3) Decreasing =(-1,1)[3,) Concave down =(-,0)(2,4) Concove Up=(0,2)(4,)(c) Let f(x)=x35x23x7, find the intervals of concavity and the intervals where it's increasing/decreasing.