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Design a WhatsApp-like chat application that supports one-to-one and group messaging, message delivery status tracking (sent, delivered, read), offline message queuing, end-to-end encryption, and real-time notifications. The system should scale to 1 billion daily active users sending 100 billion messages per day with <100 ms median delivery latency and 99.99 % availability. Discuss how you would handle message ordering, deduplication, media sharing, presence indicators, and push notifications across mobile and web clients.