问题：
[单选题] In the（ ），businesses offer services for which they charge a fee that is based on the number of size of transactions they process.Some of these services lend themselves well to operating on the Web.
A、Fee-for-Transaction Revenue Model
B、Advertising-Supported Revenue Models
C、Web Catalogue Revenue Models
D、Value chain
参考答案：
A、Fee-for-Transaction Revenue Model
● 参考解析
