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System Design Quiz Practice
Active Recall Drill Session
← Exit Session
Question 1 of 1
medium
System Design
In the worked live-comments example, why is a WebSocket chosen over polling for live updates?
A
WebSocket is always the correct default choice regardless of scale
B
Given thousands of concurrent viewers, polling's per-client repeated-request overhead becomes a real cost at that scale, and the requirement is explicitly server-initiated push, not client-driven repeated asking
C
Polling doesn't work at all technically for comments
D
WebSocket requires no server-side infrastructure
Check Answer