In LISP, the function returns t if is a CONS cell and nil otherwise: A. (cons) B. (consp) C. (eq) D. (cous =) E. None of the above

The following are examples of cons cells:

(cons 1 2)

(cons ‘a ‘b)

(cons ‘(1 2 3) ‘(4 5 6))

The following are examples of objects that are not cons cells:

1

‘a

(1 2 3)

(4 5 6)

To test whether an object is a cons cell, you can use the (consp) function. For example, the following code will return t because the object (cons 1 2) is a cons cell:

(consp (cons 1 2))

The following code will return nil because the object 1 is not a cons cell:

(consp 1)