Which of the following key points should be fulfilled in "in the matter"?

In the security protection system of cloud era, reforms must be carried out in advance, in the event, and afterwards, and continuous improvement and development of closed loops must be formed.

Which of the following key points should be fulfilled in "in the matter"? (Multiple choices)
A . Vulnerability information
B . Defense in depth
C . Offensive and defensive situation
D . Counterattacks Hackers

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Answer: BD