given the decision tree below for a two$-$stage $($decision$)$ project to enter a joint venture find the best alternatives $($among a$1$ to a$6$ in the figure$)$ and they expected value. the outcomes shown are Revenue and the Investment expenses are in parentheses. Node $4$ represents the situation where Alternative a$1$ was chosen, and then the top outcome with a $70\%$ probability occurred note that they is not choice of alternative if the $30\%$ probability outcome occurred. similarly with node $5$