Which major drawback of configuring machine access restriction on the RADIUS server for a wireless deployment is true?

Which major drawback of configuring machine access restriction on the RADIUS server for a wireless deployment is true?
A . This scenario is possible only with EAP-Chaining, which is not yet an industry standard.
B . If the user pits his PC to sleep overnight, the OS sends only a user authentication when the session is resumed and no machine authentication. Depending on the time for which the RADIUS server caches the MAR, this can create issues.
C . It is possible to do machine authentication only when using a Windows machine with the Microsoft default supplicant.
D . Regardless of the client and/or protocols being used, at this moment in time, MAR is possible only when using Cisco ISE as the AAA RADIUS server. No other AAA servers currently support MA

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Answer: B