Given is a Decision Tree Diagram. The Payoffs $1-14$ are given in the table below. Answer questions a$,$ b$,$ and c$.$

a$)$ The value at node $4$ is type your answer...

b$)$ The value at node $8$ is type your answer...

$($in $1$ decimal place$)$

c$)$ The best course of action or decision is to select alternative type your answer...