Why can’t the Onguard posture check be done during 802.1x authentication?

Why can’t the Onguard posture check be done during 802.1x authentication?
A. Onguard uses TACACS so an additional service must be created.
B. 802.1x is already secure so Onguard is not needed.
C. Health Checks can’t be used with 802.1x.
D. Onguard uses RADIUS so an additional service must be created.
E. Onguard uses HTTPS so an additional service must be created.

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