All of the following statements about digital time stamps are true except:A:The digital timestamp is provided by the DTS service organization. B:Time-stamped files can be modified. C:The digital time stamp is used exclusively to prove the time the message was sent. D:It is not possible to timestamp a file with a date and time different from the current date and time. 答案: Time-stamped files can be modified.Chapter 4 Internet Marketing Unit 4 Test