In the context of mathematics, Function can be defined as the relationship between one independent variable with two or more dependent variables. It can also be said as the relational set of inputs with its permissible outputs.
The domain is the term that describes the set of all possible input values for a given function.
Thus, option D. is correct.
The set for a domain contains all the possible independent variables or it can be input values for the given defined function. The domains for each function keep on changing.
For example: The domain of a polynomial function can be the entire set of real numbers, with a defined condition that is the function or the value of x cannot be equal to zero.
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