Opening the paper…
Question text from the original paper, with its maths as pictures A news platform wants to send a morning digest email to all subscribers every day at 7 AM. Sweta sets up the beat schedule, starts Redis and Celery Beat, and then claims: "The Worker is optional here. Beat handles the scheduling and the execution of the task, so we do not need a separate Worker process."\ Is Sweta's claim correct? Choose the best answer. A startup is building a food delivery app. The customer-facing screen shows live order status updates: "Order Placed → Preparing → Out for Delivery → Delivered".\ Each stage is triggered by the restaurant or the delivery rider updating the status on their end. The customer's screen should reflect these changes in real time without refreshing the page.\ Two developers debate about the right technology: Developer A says: "Let's use Server-Sent Events. It's the right fit here." Developer B says: "No, we must use WebSockets. SSE won't work."\ Who is correct, and why?