Emma wants to set up a wedding planning website for weddings in her city. She needs a site where ...

Emma wants to set up a wedding planning website for weddings in her city. She needs a site where caterers, florists, and designers from the city can post their offerings and prices for a fee. As the products and rates will change with the seasons, the site will have to be updated often by the sellers themselves. Prospective customers should be able to register on the site to read the information, but should not be able to make any changes to the site. Which of the following is the best option for Emma?
A.    a social networking site
B.    a central content management system
C.    a public wiki
D.    a private wiki