To answer this question, you need to understand the purpose of each command and how they can be used to modify or manipulate data in a database.
Let's go through each option to understand why it is correct or incorrect:
Option A) DEFINE - The DEFINE command is typically used to create or define a new object in the database, such as a table or a view. It is not used to modify existing data or change specific values.
Option B) DELETE - The DELETE command is used to remove specific records or rows from a table. It is not used to change the value of a specific field or attribute.
Option C) REPRO - The REPRO command is typically used to reproduce or create a copy of an existing dataset or file. It is not used to modify specific values within a dataset or file.
Option D) ALTER - The ALTER command is used to modify the structure or properties of an existing object in the database, such as a table. It can be used to add, modify, or delete columns, change data types, or modify constraints. In this case, the ALTER command can be used to change the value of the INHIBITSOURCE attribute to NOINHIBITSOURCE or vice versa.
The correct answer is D) ALTER. This option is correct because it is the command used to modify the structure or properties of an existing object in the database, allowing us to change the value of the INHIBITSOURCE attribute.