Consider the following directed acyclic graph

a$.(2$ pts$)$ Identify all of the sources and sinks in the graph.

b$.(3$ pts$)$ Draw a diagram of the reverse graph of the DAG

c$.(10$ pts$)$ Use DFS with timing, showing a table of the pre$/$post values, to produce a valid linearization of the DAG.

d$.(5$ pts$)$ State two more valid linearizations of the DAG