Which of the following is the source of demand for network optimization? (Multiple Choice)

 Which of the following is the source of demand for network optimization? (Multiple Choice)
A .  After long-term network maintenance, some summarized problems and improvement points, put forward relevant suggestions, and carry out centralized rectification
B .  Video conferencing services need to be carried out in the network, and switching equipment supporting Layer 2 multicast functions needs to be added
C . The environmental problem of a weak current well, the signal line is seriously aging, and needs to be replaced collectively
D . For corporate information security needs, add new security equipment

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Answer: ABCD