Final answer:
The range of the function f(x) = 5 is all real numbers greater than or equal to 5.
Step-by-step explanation:
The range of the function f(x) = 5 is D. All real numbers greater than or equal to 5. This means that any value of x that is greater than or equal to 5 will result in a corresponding output value of 5. For example, f(5) = 5, f(6) = 5, f(7) = 5, and so on.