Which e-commerce protocol is defined as the inter-organization exchange of documents in standardized electronic form directly between participating computers?

Which e-commerce protocol is defined as the inter-organization exchange of documents in
standardized electronic form directly between participating computers?

A.
Electronic Data Interchange (EDI)

B.
Hypertext Transfer Protocol (HTTP)

C.
Open Buying on the Internet (OBI)

D.
Secure Electronic Transactions (SET)