Which of the following are sources of network optimization requirements? (Multiple Choice)

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Which of the following are sources of network optimization requirements? (Multiple Choice)
A . After long-term network maintenance, propose suggestions and improvements for centralized rectification.
B . As the videoconferencing service is required on the network, add switching devices that support Layer 2 multicast.
C . Replace severely aged signal cables in an ELV well.
D . For enterprise information security, deploy new security devices.

Answer: ABCD

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