4. Given the following Lisp code: (de fun addandmult (a b c) (a) Explain, in a sentence, what the above Lisp program does. (b) Write an expression in Lisp to add 5 and 6 and then multiply that result by 7 with the defined function addandmult. That is, invoke that function addandmult in Lisp. (c) Translate the Lisp function addandmult to C or C++ code. That is, write the same function in C/C++