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Which combination minimises egress cost for streaming a video service to global users?
AAWS Direct Connect for every viewer's house
BDirect serving from a single EC2 instance in one AZ
CAmazon CloudFront in front of S3 — egress from CloudFront is significantly cheaper than direct S3-to-internet egress at scale and absorbs most repeat traffic from edge caches
DDirect serving from a single S3 bucket in us-east-1 with no CDN
Answer & Solution
Correct answer: C. Amazon CloudFront in front of S3 — egress from CloudFront is significantly cheaper than direct S3-to-internet egress at scale and absorbs most repeat traffic from edge caches
CloudFront caches at edge, reduces origin egress, and benefits from cheaper edge-egress pricing tiers. Direct S3-to-internet is expensive; single EC2 doesn't scale; per-viewer Direct Connect is impossible.
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