What is the definition of multiplicative inverse?

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Athe product of a number and its multiplicative inverse is 1. Example: -8/5 x 5/-8 = 1

Bthe product of a number and its multiplicative inverse is 0. Example: - 11/2 x 11/2 = 0

Cthe product of a number and its multiplicative inverse is 0. Example: 7x (-7) = 0

Dthe sum of a number and its multiplicative inverse is 0. Example: 15/29 + (- 15/29) = 0

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Is the answer A, B, C or D?