What is the value of ( frac{d}{dx}( frac{a^x}{e^x}) )?

• A. ( frac{a^x (ln , u2061a-a^x)}{e^x} )
• B. ( frac{a^x (ln , u2061a-e^x)}{e^x} )
• C. ( frac{a^x (ln , u2061a-1)}{e^x} )
• D. ( frac{a^x (ln , u2061a-1)}{(e^x)(e^x)} )