User authentication is a procedure that allows communicating parties to verify that the contents of a received message have not been altered and that the source is authentic. Select one: True False Question 19 Not yet answered Points out of 5 Not flaggedFlag question Question text Objects that a user possesses for the purpose of user authentication are called Answer Question 20 Not yet answered Points out of 5 Not flaggedFlag question Question text To counter threats to remote user authentication, systems generally rely on some form of protocol. Select one: a. eavesdropping b. Trojan horse c. challenge-response d. denial-of-service