In NoSQL terminologies on database structure, which of the following is$$NOT$$part$$of$$it $?$

Question $1$ options:

Collection: A set of records, typically documents, that are grouped together. This is based not on a property within the record set, but within its metadata.$$

Schema: In RDBMS and to a certain extent column$$stores$.$ The structure of the data must be configured in the database before any data is loaded.$$

Collection: Assigning a record to a collection is usually done at creation or update time.$$

Normal form: A method of normalizing, or minimizing duplication, in data in an RDBMS$.$