Fill in the blank. Suppose R is a commutative ring such that for a, b, and c in R, ab = ac implies b = c.At the very least, R has to be a(n) ________________.

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Fill in the blank. Suppose R is a commutative ring such that for a, b, and c in R, ab = ac implies b = c.At the very least, R has to be a(n) ________________.