13. Which of the following is true concerning California-licensed real estate professionals selling manufactured homes? a. Real estate licensees can sell manufactured homes as long as the manufactured homes also can be used as vehicles on the highway. b. Real estate licensees are not allowed to sell manufactured homes if they also can be used as vehicles on the highway. c. Real estate licensees can earn twice the commission on a manufactured home if it can be used as a vehicle on the highway. d. Real estate licensees are required to hold a Manufactured Home Sales (MHS) endorsement to sell manufactured homes legally in California, regardless of whether the manufactured homes can be used as vehicles on the highway or not.