Consider a network of 5 nodes as shown below. The edges represent the range of transmission/reception for each node. Edges with no arrows implies both nodes are within transmission/reception of each other. An edge with an arrow implies the communication link is only one-directional. a) For the nodes A, B, C and D: if A is transmitting to B, then can C transmit simultaneously to D? [3+2+2=7] Explain your answer. b) For the given network below, list all node triplets that could potentially suffer from the Hidden node problem. List all sets of 4 nodes that could potentially suffer from the Exposed node problem. c)