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As a developer migrating an on-premises MySQL database for a social media platform to Google Cloud's Firestore, how would you design the Firestore collections to store user profiles and posts effectively?
A
Create one root collection for user profiles, and create one root collection for user posts.
B
Create one root collection for user profiles, and create one subcollection for each user's posts.
C
Create one root collection for user profiles, and store each user's post as a nested list in the user profile document.
D
Create one root collection for user posts, and create one subcollection for each user's profile.
