For the Past 20 Years, Peter Has Been an Owner

For the past 20 years, Peter has been an owner of several Coldwell Banker Real Estate franchises. To increase business, Peter spends a great deal of money marketing and advertising his businesses online. Peter decides he would like to move beyond just marketing and create an actual ebusiness that acts like a search engine but only focuses on the real estate industry. The main revenue source for Peter's ebusiness will be a charge of $50 a month for each property that is listed on the website. What is the primary revenue model for Peter's new business?

A) License fees
B) Advertising fees
C) Subscription fees
D) All of these