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Answer:

Your answer is right, it is the last one....

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Step-by-step explanation:

The domain of a function is the complete set of possible values of the independent variable. ... The domain is the set of all possible x-values which will make the function "work", and will output real y-values. When finding the domain, remember: The denominator (bottom) of a fraction cannot be zero.

Credit:

Domain and Range of a Function - Interactive Mathematics