Question 6: Correct statement

An index doesn’t become multikey until a document is inserted that has an array value.

Instead of a document, shouldn’t it be ‘key’ so the statement should say
An index doesn’t become multikey until a key is inserted that has an array value.

Hi @Anjali_Raghav,

You bring up a great point here.
It should be:

An index doesn’t become multikey until a document is inserted that has an array field.

or

An index doesn’t become multikey until a key is inserted that has an array value.
where key refers to a field in MongoDB

I will share this with the team and we will be looking into the wordings again.

Thanks for sharing this!!

Kind Regards,
Sonali