You are a developer at a social media company The company runs their social media...

Create one root collection for user profiles, and store each user's post as a nested list in the user profile document.

Create one root collection for user profiles, and create one root collection for user posts.

Create one root collection for user profiles, and create one subcollection for each user's posts.

Create one root collection for user posts, and create one subcollection for each user's profile