The correct option is API selection for the account.

You must choose the account API when you create an Azure Cosmos DB account and the API selection for the account cannot be changed later for that account. The choice determines the protocol and data model such as Core (SQL), MongoDB, Cassandra, Gremlin, or Table and so if you need a different API you must create a new account and migrate your data.

Multi region writes can be enabled or disabled and configured by adding or removing regions and updating account settings after the account exists, so this option is not restricted to the initial creation.

Geo replication regions are managed through the Global Distribution feature and you can add or remove replica regions after the account is created, so region replication is not fixed at creation time.

Account provisioning tier for production or development is not a single immutable selection that is enforced only at creation. Many provisioning and throughput settings can be adjusted after creation, although very large or structural changes may require creating a new account and migrating data.

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