Which of the following guarantees "should detect and protect spam at critical network nodes and maintain upgrades and updates of the spam protection mechanism" in security 2.0?

Which of the following guarantees "should detect and protect spam at critical network nodes and maintain upgrades and updates of the spam protection mechanism" in security 2.0?
A . Malicious code prevention
B . Communication transmission
C . Centralized control
D . Border protection

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Answer: A