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| Which of the following statements is correct concerning the security of messages in an electronic data interchange (EDI) system? A. Message authentication in EDI systems performs the same function as segregation of duties in other information systems. B. Security at the transaction phase in EDI systems is not necessary because problems at that level will be identified by the service provider. C. Encryption performed by a physically secure hardware device is more secure than encryption performed by software. D. Removable drives that can be locked up at night provide adequate security when the confidentiality of data is the primary risk. |