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D.. I don't see the options or thw graph clearly but If it is in the middle of 1 and 2 then it is y =1.5 that means it doesn't have a slope and the y intercept is 1.5

Answer:

The domain of the function is:

                     Option: C

         C.   x is all real numbers.

Step-by-step explanation:

We are given a graph as a straight horizontal line.

Also, the line extends to infinity in both the direction.

This means that the domain of the function is all the real numbers.

Since, the function takes a constant value for all the real numbers.

Hence, the range of the function is the fixed constant i.e. 1.5

Hence, the function is a constant function as we know that the constant function is defined all over the real line.

        Hence, the answer is:

         C.   x is all real numbers.

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