Describe the meanings of all the variables in the exponential functionQ=Q0 (1+r) t Explain how the function is used for exponential growth and decay. Choose the correct answer below. Select all that apply. A. The function is used for exponential growth if r<0B. The function is used for exponential decay if r>0C. The function is used for exponential growth if r>0D. The function is used for exponential decay if r<0.