Which of the following statements about IPSG is false?

Which of the following statements about IPSG is false?
A . IPSG can prevent IP address spoofing attacks
B. IPSG is a source IP address filtering technology based on Layer 3 connection
C. The IPSG can enable the IP packet inspection alarm function, and link the network management to alarm
D. IPSG can prevent the host from changing the IP address privately

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Answer: B