Which of the following is true? For a pair of functions to be inverses, their compositions must be equal to 1. In an inverse

Question

Which of the following is true?
For a pair of functions to be inverses, their compositions must be equal to 1.
In an inverse relation, coordinates of the ordered pairs are multiplied by 2.
The horizontal line test is used to determine if a function's inverse will be a function.
An inverse of a function is always a function.

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