Which of the following statements regarding border security optimization are true? (Multiple Choice)

Which of the following statements regarding border security optimization are true? (Multiple Choice)
A . Border security optimization aims to prevent or reduce external network attacks and harm.
B . The optimization position is usually located at the network edge.
C . Optimization measures include attack defense technologies, packet filtering, and hardware firewalls.
D . Border security optimization aims to achieve secure user access control.

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Answer: ABC