Which of the following is an example of a business-to-business e-commerce transaction?

Which of the following is an example of a business-to-business e-commerce transaction?

A.
A purchase placed from one company to another using a secure e-mail method

B.
A purchase placed from one company to another using a faceo-face credit transaction.

C.
A purchase placed on the World Wide Web from a consumer to buy a company products.

D.
A purchase placed from one company to another using a face-to-face cash transaction