To answer this question, you need to understand the concept of aliases and privileges in database management systems.
An alias is an alternative name given to a table or column in a database. It allows you to refer to the table or column by a different name in your queries, which can be helpful for simplifying or clarifying your code.
In this case, USER1 wants to utilize an alias to remove rows from a table. To do this, USER1 needs the DELETE privilege on the table. The DELETE privilege allows the user to delete rows from a table.
Let's go through each option to understand why it is correct or incorrect:
Option A) DELETE privilege on the table - This option is correct because USER1 needs the DELETE privilege on the table to remove rows from it.
Option B) DELETE privilege on the alias - This option is incorrect because privileges are granted on the underlying table, not on the alias. The alias is just a different name for the table and does not have its own set of privileges.
Option C) DELETE privilege on the alias; REFERENCES privilege on the table - This option is incorrect because, as mentioned earlier, privileges are granted on the underlying table, not on the alias. The REFERENCES privilege is used to create foreign key constraints, not for deleting rows.
Option D) REFERENCES privilege on the alias; DELETE privilege on the table - This option is incorrect for the same reasons as option C. The REFERENCES privilege is not needed for deleting rows, and privileges are granted on the underlying table, not on the alias.
Therefore, the correct answer is option A. USER1 needs the DELETE privilege on the table to remove rows from it.