What action is required to filter records in the Department table to show only 'Marketing'?

To filter records in the Department table to display only those where the department name is 'Marketing', it is necessary to use a condition in the query that specifies this criterion. The correct action involves utilizing a 'WHERE' clause. By changing the 'WHERE' clause in the SQL statement to 'WHERE DeptName = Marketing', it precisely sets the condition that the query should only return records where the 'DeptName' field matches 'Marketing'.

This method effectively narrows down the results to include only the relevant entries, keeping the data organized and focused on the specific department. In SQL, the 'WHERE' clause is essential for filtering data according to set conditions, ensuring that only those records that meet the specified criteria are presented in the output.

The other choices do not achieve the required filtering correctly: adding 'DeptName = Marketing' in the SELECT statement lacks the filtering capabilities as it does not utilize the proper syntax necessary for the query, inserting 'Marketing' into the Department records does not relate to filtering but instead involves modifying the data itself, and deleting records where 'DeptName' is not 'Marketing' would result in data loss rather than simply extracting the desired information.