66. Let R be a ring with multiplicative identity. If U is an additive subgroup of R such that ur "belongs to" U for all u "in" U and for all r "in" R, then U is said to be a right ideal of "R". If R has exactly two right ideals, which of the following must be true?
I. R is commutative
II. R is a division ring (that is all elements except the additive identity have inverses)
III. R is infinite
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