Which of the following is a common relational database management system (RDBMS)?

Oracle is a widely recognized relational database management system (RDBMS) used for managing and organizing data in a structured format. It utilizes SQL (Structured Query Language) for querying and maintaining the database. Oracle is designed to handle large volumes of data and supports complex transactions, making it suitable for enterprise-level applications where data integrity and multi-user access are crucial.

In contrast, Google Cloud Storage, Microsoft Excel, and Amazon S3 do not fit the traditional definition of an RDBMS. Google Cloud Storage is primarily a cloud storage service used for storing large amounts of unstructured data, not a system for managing relational data. Microsoft Excel is a spreadsheet application that can perform data analysis and storage, but it lacks the robust features characteristic of an RDBMS, such as multi-user transaction processing and relational data management. Amazon S3, like Google Cloud Storage, is a cloud storage solution designed to store and retrieve large amounts of unstructured data but does not provide database management capabilities.

Therefore, Oracle is the correct choice as it is a well-established RDBMS that supports relational data structures, transaction processing, and complex queries.