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The requirement that the database account used must have read and write permissions is crucial for using the DTS (Data Transmission Service) data migration solution for RDS (Relational Database Service). This is because DTS needs to access the source database to read data and write it to the target database. Without the appropriate permissions, the service would be unable to complete the migration process, leading to failures in transferring data.

The need for read permissions ensures that DTS can extract the necessary data from the source database, while the write permissions are essential for inserting that data into the target database. This requirement is fundamental to ensure a seamless migration experience, as it guarantees that DTS can effectively manage and execute the data transfer without any access-related obstacles.

The other options are not true requirements for using the DTS solution. Specific data tables can typically be selected for migration based on the user's needs. The source database does not necessarily have to be offline during migration, as DTS supports online migrations to allow for continued operation during the process. Additionally, there is no strict requirement to create a new database instance beforehand; the migration can occur between existing database instances, depending on the desired architecture and setup.