Use the graph below to find exact values for the indicated derivatives, or state that they do not exist. If a derivative does not exist, enter dne in the answer blank. The graph of [math] is black and has a sharp corner at [math]. The graph of [math] is blue.

graph of a piecewise linear function f, in black, and and linear function g, in blue.  f extends from (0,0) to (2,2) to (4,0).  g extends from (0,2) to (4,0).

Let [math]. Find

A. [math]
B. [math]
C. [math]

(Enter dne for any derivative that does not exist.)