if and only if, math homework help

Write the statement below as a biconditional.

“A water molecule is composed of exactly 2 hydrogen and 1 oxygen atom.”

a. If a molecule is water, then it is composed of exactly 2 hydrogen and 1 oxygen atom

b. A molecule is water if and only if it is composed of exactly 2 hydrogen and 1 oxygen atom

c. A molecule is not water if and only if it is not composed of exactly 2 hydrogen and 1 oxygen atom

d. A molecule is water if and only if it is not composed of exactly 2 hydrogen and 1 oxygen atom

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