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Explanation/Reference: Explanation: Synchronous dynamic password tokens generate new passwords at specific time intervals that are synched with the main system. Passwords are only valid for a specific time period. Incorrect Answers: B: With synchronous dynamic password tokens, a timer is used to rotate through various combinations produced by a cryptographic algorithm. Therefore the password will be unique. C: With synchronous dynamic password tokens, the user enters the generated value and a user ID (this could be a PIN) into the computer, which then passes them to the server running the authentication service. D: This is incorrect as the time value on the token device and a secret key is used to create the one-time password, which the authentication service decrypts and compares to the value it expected. References: http://www.informit.com/guides/content.aspx?g=security&seqNum=146 https://en.wikipedia.org/wiki/Security_token Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 196