Differentiate the function h(t) =9√t​−9eᵗ.
A. h′(t) =1/9t⁸​−9eᵗ
B. h′(t) =1/9t⁸​+9eᵗ
C. h′(t) =1​/9 t⁸−9eᵗ
D. h′(t) =1/9 ​t⁸+9eᵗ