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Answer D is correct. A basic requirement for using smart card authentication is that the workstation must be a member of a domain. Answer A is incorrect because if the firewall wasn’t open, you wouldn’t be able to log on from your own laptop from that network. Answer B is incorrect because the only change that has been made from when the computers previously worked is removing them from the domain. Answer C is incorrect because your user account is obviously configured correctly; it works on your laptop, although it doesn’t work on the workstations in question.