Please answer all, I will upvote!

Question 18 When an official exchange experiences an imblance in a listed stock's supply or demand, a specialist known as a may step in and purchase or sell shares. Not yet answered O a. equity balancer Points out of 1.0 b. b. seasoned trader P Flag question O c. capital funder d. market maker Question 19 Which of the following are not considered to be money market securities? Not yet answered Points out of 1.0 Flag question Select one: O a. a. Commercial paper and preferred stock Ob Repurchase agreements and negotiable certificates of deposit O c. Bankers acceptances and U.S. Treasury bills O d. U.S. Treasury bills and commercial paper Question 20 Which of the following securities are not traded over-the-counter (OTC)? Not yet answered Points out of 1.0 Select one: O a. Corporate bonds, listed stocks, derivatives Flag question O b. Listed stocks, government bonds, corporate bonds c. Government bonds, unlisted stocks, corporate bonds O d. None of these answers are correct