that oil exists. Using a decision tree, recommend a course of action for Shamrock Oil. Choose the correct decision tree that corresponds to the options of Shamrock Oil. Note that all payoffs are in thousands of dollars. What is the best course of action for Shamrock Oil? A. Test the land. If the test is positive, sell the land. If the test is negative, drill the land. B. Drill the land without any investigations. C. Test the land. If the test is positive, drill the land. If the test is negative, sell the land. D. Sell the land without any investigations. The expected payoff is $ (enter your response as a whole number)