Which of the following accurately explains "cursive small delta notation of partial derivative"? Question 3Answer a. a notation where the subscripts indicate with regard to which variables derivatives of a function are taken; e.g., if the subscript is "24" then this indicates a second-order partial derivative where first a derivative is taken with regard to the second v b. a notation that uses the cursive writing of the Greek letter Delta to indicate with regard to which variable derivatives of a function are taken