The following description of the key technologies of content delivery network CDN, which one is correct? Single selection
Dynamic and static separation: dynamic content edge nodes are slowed down
Warm-up: Edge nodes actively cache dynamic content to reduce pressure on the origin server
Intelligent image adaptation: judge the network situation and intelligently adjust the image format
D. Refresh: After the origin server file is updated. the old file of the edge node can be automatically overwritten
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