4. A shop sign is hung from a brick wall with a single post, P. The weight of the sign, W, can be considered to act down from the end of the post as shown in the diagram. The dotted lines A,B and C show three possible positions in which to put an additional chain to make the sign more secure.
a. Analyze the diagram and state which is the best position for the chain, A,B or C?
b. Why do you think this? Explain your answer.
