A function f(x) is given below. Express the relationship between f'(x) and f(x) in words, and write a differential equation that f(x) satisfies. f(x) = 19e x Express the relationship between f'(x) and f(x) in words. Choose the correct answer below. A. The derivative of f(x) is -1 times e raised to the -x-1 power. OB. The derivative of f(x) is the same as f(x). OC. The derivative of f(x) is - 1 times f(x). OD. The derivative of f(x) is - 19 times f(x). f(x) satisfies the differential equation y' = (Type an expression using y as the variab.)