Self-Managed Database Admin Lesson 3: Modeling Data Relationships /practice

Hi,

In that question I don’t understand the the first option.

The explanation of the first option is : *"Creating two collections, one for accountsand one forcustomer_info , aligns with the customer's requirements. It also ensures that data that is accessed together is stored together."*

I don’t know how the data is stored together when the data is inserted in two different collections. Can someone give me a brief explanation?

Thanks!

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