If f(x) = [ex + ln(x)]-13, what is f '(x)? a.-13[ex + ln(x)]-12[ex + (1/x)] b.-13[ex + (1/x)]-12[ex + ln(x)] c -13[ex + ln(x)]-14[ex + (1/x)] d -13[ex + (1/x)]-14[ex + ln(x)] none of these