Determine whether the rule represents an exponential function. Explain why or why not.

y=-8/x^3
Choose the correct answer below.
A.
Since the independent variable x is not the​ base, does not represent an exponential function.
B.
Since the independent variable x the​ exponent, an exponential function.
C.
Since the independent variable x the​ exponent, an exponential function.
D.
Since the independent variable x is the​ base, does represent an exponential function.