You recently developed an application that monitors a large number of stock prices. You need to configure Pub/Sub to receive messages and update the current stock price in an in-memory database. A downstream service needs the most up-to-date prices in the in-memory database to perform stock trading transactions. Each message contains three pieces or information:
• Stock symbol
• Stock price
• Timestamp for the update
How should you set up your Pub/Sub subscription?

A. Create a push subscription with exactly-once delivery enabled. B. Create a pull subscription with both ordering and exactly-once delivery turned off. C. Create a pull subscription with ordering enabled, using the stock symbol as the ordering key. D. Create a push subscription with both ordering and exactly-once delivery turned off.