The correct answer is Inserts and updates.

Azure Cosmos DB change feed provides an ordered stream of item changes that reflects newly created documents and documents that have been modified. It exposes inserts and updates so downstream processors can react to new items and changes in near real time. The standard change feed does not emit delete operations.

The option Inserts updates and deletes is incorrect because the standard change feed does not include deletes. There is a separate Full Fidelity change feed mode that can capture deletes but that is an opt in capability and not the default behavior.

The option Updates only is incorrect because it omits newly inserted documents which the change feed also surfaces.

The option Inserts only is incorrect because the change feed also includes updates to existing items.

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