O conveys "to A so long as the land is used as a farm, then to B." Under the common-law Rule Against Perpetuities, what is the state of title?
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A
A has a fee simple determinable and O has a possibility of reverter, because B's executory interest is void
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B
A has a fee simple absolute
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C
B has a valid executory interest that may vest anytime
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D
O has a right of entry exercisable at will