Which of the following is a limitation of the Anypoint Object Store?

The choice indicating that data is automatically removed after 30 days accurately reflects a limitation of the Anypoint Object Store. This store is intended for temporary data storage, which offers a mechanism to manage data lifecycle effectively. The 30-day retention policy is designed to prevent the object store from being overloaded with stale data that is no longer needed, thus ensuring optimal performance.

While the other options indicate features or capabilities of the Anypoint Object Store, they do not highlight limitations. For example, the ability to support transactions is a significant feature that enables developers to perform operations that require consistency. Storing unlimited data is not a reasonable expectation; the Object Store has predefined limits based on the chosen plan. Similarly, while data can be kept for extended periods, the indefinite retention policy is not typical for the Anypoint Object Store, given its focus on managing data effectively within certain constraints. Therefore, the retention policy of removing data after 30 days is indeed the most appropriate representation of a limitation within this context.