Explain the difference between a database administrator and a data administrator. List Five important DBA tasks.Explain the trade$-$off that exists in concurrency control. Explain the difference between an explicit and an implicit lock. Explain the meaning of the expression ACID transaction and define how the boundary of a transaction is defined.What SQL statements are considered as SQL Transaction Control Language? Provide three examples. Explain the term SQL cursor. Provide an example of the use of a dynamic cursor. List two elements of a database security plan. Describe rollback and roolforward. Explain why a data repository is important.