Final answer:
The range of function f is all real numbers.the correct answer is option d) All real numbers.
Step-by-step explanation:
The range of function f is d) All real numbers.
When we have a horizontal line, as described in the question, the y-coordinate of every point on the line remains the same. Since all real numbers are included in the range of the function, the y-coordinate can be any real number.The range of a function is defined as the set of all possible output values (y-values) as a result of plugging the domain (x-values) into the function. Based on the information provided, we have several scenarios to consider.