A. Check for non-existence of data in child tables. Depending on the requirements, the system will notify or automatically delete the data inside the child tables when the parent table data is lost. B. Check the existence of data in the child tables. Depending on the requirements, the system will notify or automatically delete the data inside the child tables when the parent table data is lost. C. Create data persistence in child tables. Depending on the requirements, the system will notify or automatically delete the data inside the child tables when the parent table data is lost. D. Check the existence of data inside the tables * Depending on the requirements, the system will notify or automatically delete data inside the child tables when the parent table data is lost Link Hoc va de thi 2021