How should you structure the data in Firestore when designing a chat room application that hosts multiple rooms and retains message history for each room?

Exam-Like

Create a collection for the rooms. For each room, create a document that lists the contents of the messages

11.1%

Create a collection for the rooms. For each room, create a collection that contains a document for each message

55.6%

Create a collection for the rooms. For each room, create a document that contains a collection for documents, each of which contains a message.

19.4%

Create a collection for the rooms, and create a document for each room. Create a separate collection for messages, with one document per message. Each room’s document contains a list of references to the messages.

13.9%

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How should you structure the data in Firestore when designing a chat room application that hosts multiple rooms and retains message history for each room?