To answer this question, we need to understand the concept of object privileges and views.
Object privileges are permissions that can be granted to users on database objects such as tables, views, or procedures. These privileges determine the actions that a user can perform on the object, such as SELECT, INSERT, UPDATE, or DELETE.
A view is a virtual table created from the result of a query. It does not contain any data itself but presents data from one or more underlying tables. Users can interact with views as if they were regular tables, but the underlying data is not directly modified.
In the given options, the correct answer is D. DELETE, INSERT, SELECT, UPDATE. This means that users can be granted the privilege to perform DELETE, INSERT, SELECT, and UPDATE operations on the view. With these privileges, users can modify and retrieve data from the view, just as they would with a regular table.
Let's go through each option to understand why it is correct or incorrect:
Option A) none - This option is incorrect because users can be granted object privileges on views.
Option B) DELETE, INSERT, SELECT - This option is incorrect because it does not include the UPDATE privilege, which allows users to modify data in the view.
Option C) ALTER, DELETE, INSERT, SELECT - This option is incorrect because it includes the ALTER privilege, which is not applicable to views. The ALTER privilege is used for modifying the structure or properties of database objects, such as tables or procedures.
Option D) DELETE, INSERT, SELECT, UPDATE - This option is correct because it includes all the necessary privileges (DELETE, INSERT, SELECT, and UPDATE) that can be granted on a view.
Therefore, the correct answer is D. DELETE, INSERT, SELECT, UPDATE. This option is correct because it includes all the privileges that can be granted on a view.