Find the derivative of the function f(t)=tan(e^(7t))+e^(tan(7t)). What is the value of f'(t)? A) 7tan(e^(7t))+7e^(tan(7t)) B) tan(e^(7t))+e^(tan(7t)) C) 7tan(e^(7t))+e^(tan(7t)) D) 7tan(e^(7t))+e^(tan(7t))