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What type of function has a domain that is a singleton set?

  1. One-to-one

  2. Constant

  3. Inverse

  4. Integral

The correct answer is: Constant

A one-to-one function does not have a singleton set as its domain, nor does an inverse function. An integral function may have a singleton as a representative of an interval for its lower and upper bounds, but not necessarily in its domain. Therefore, the correct answer is option B Constant. A constant function has a single output value for every input and thus has a singleton set as its domain.