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A content delivery network (CDN) primarily improves application performance by:
AEncrypting data at rest with longer keys
BCaching content at edge locations geographically close to end users
CSharding the relational database across continents
DCompressing the application's source code to be 50% smaller
Answer & Solution
Correct answer: B. Caching content at edge locations geographically close to end users
CDNs (CloudFront, Azure Front Door / Azure CDN, Cloud CDN) cache static and increasingly dynamic content at edge POPs so users get content from a nearby cache — much lower latency than reaching the origin. The other options are unrelated optimisations.
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