Choice "C" is correct. Electronic Data Interchange (EDI) is usually effected through a Value Added Network (VAN). However it can be effected through the Internet.
Choice "b" is incorrect. Electronic Data Interchange (EDI) is usually effected through a Value Added Network (VAN), not the Internet. However, EDI may be effected through the Internet.
Choice "a" is incorrect. Electronic Data Interchange (EDI) is usually effected through a Value Added Network (VAN), not a private corporate intranet.
Choice "d" is incorrect. Electronic Data Interchange (EDI) is usually effected through a Value Added Network (VAN), not an extranet.
