The correct answer is: D. All of the above
When a top-level function is entered, the LISP processor reads the function entered, evaluates the function and the function’s operands, and prints the results returned by the function.
Here is a brief explanation of each option:
- A. It reads the function entered
The LISP processor reads the function entered from the user. The function can be entered as a string or as a list.
- B. It evaluates the function and the function’s operands
The LISP processor evaluates the function and the function’s operands. The function’s operands are the values that are passed to the function.
- C. It prints the results returned by the function
The LISP processor prints the results returned by the function. The results of the function are the values that are returned by the function.
Here is an example of a top-level function:
(defun add (x y) (+ x y))
This function takes two operands, x and y, and returns their sum. When this function is entered, the LISP processor will read the function, evaluate it, and print the result. The result of this function will be the sum of x and y.