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Which of the following MUST be true if Dan acts as if he maximizes a utility function and buys about 2 apples and about 2 oranges whenever apples cost $1 and oranges cost $4 Dan likes an orange about 4 times as much as Dan likes an apple when he has 2 apples O and 2 oranges O Dan should spend all of his money on apples O Dan's utility function is U = AO2 O Dan spent $12