In FTTX business networking and data planning, user security needs to be considered. Which of the following measures can prevent inter-user attacks?

In FTTX business networking and data planning, user security needs to be considered. Which of the following measures can prevent inter-user attacks?
A . Defense against IP spoofing
B. Use port physical information to identify users
C. User Layer 2 Isolation and Controlled Mutual Access
D. Use anti-mac to solve

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Answer: C