How can the netwotk administrator prevent a user on the computer from receiving network access without authentication?

Refer to the exhibits.
Exhibit 1

Exhibit 2

The IP phone in the exhibit is set up to complete 802.1x authentication to the network. How can the netwotk administrator prevent a user on the computer from receiving network access without authentication?
A. Set an 802.1X client limit of 2 on interface 1.
B. Set up the MAC filter on interface 1.
C. Enable static mode port security on interface 1.
D. Enable MAC-based VLANs on interface 1.

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