=Test: Exam(2) Question 16 List all the combinations of five objects a, b, c, d, and e taken two at a time. What is Cz? List all the combinations of five objects a, b, c, d, and e taken two at a time. Choose the correct answer below. O A. aa, ab, ac, ad, ae, bb, bc, bd, be, cc, cd, ce, dd, de, ee O B. ab, ac, ad, ae, ba, bc, bd, be, ca, cb, cd, ce, da, db, dc, de, ea, eb, ec, ed O C. a, b. c, d. e O D. ab, ac, ad, ae, bc, bd, be, cd, ce, de What is sCz? (Simplify your answer.)