10. Suppose that a decision maker faced with four decision alternatives and four states of nature develops the following payoff table. What is the recommended decision using the optimistic, conservative and minimax regret approaches? Please use V' to indicate your choice under different approaches in the table. (6 points).

Decision alternative	S1	S2	S3	S4	Optimistic approach	Conservative approach	Minimax regret
A	12	9	10	15
B	11	10	8	7
C	6	8	10	11
D	8	10	11	13