Which best describes the asymptote of an exponential function of the form f(x) = b^x?
a. vertical asymptote at x = 0
b. vertical asymptote at x = 1
c. horizontal asymptote at y = 0
d. horizontal asymptote at y = 1

C. Horizontal asymptote at .

Step-by-step explanation:

We are asked to choose the option that best describes the asymptote of an exponential function of the form .

We know that exponential functions always have horizontal asymptotes. The horizontal asymptote for an exponential function in form  is at .

Upon looking at our given function we can see that value of 'c' is 0, therefore, our given function will have a horizontal asymptote at and option C is the correct choice.

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