How Do Retailers and Vendors Ensure That Information That Passes

How do retailers and vendors ensure that information that passes back and forth between retailers and vendors is secure?

A) There is an element of trust that is necessary in doing business with one another.
B) Suppliers, customers, and new clients all have a form of access to information.
C) The system ensures that the information received has not been tampered with by ensuring that the communication is both authentic and authorized.
D) With a high level of planning, implementation and control of the flow of information, the information will be secure.
E) Paper hard copies are sent to one another for comparison to be certain that the information is accurate.