To answer this question, you need to understand the SELECT clause in SQL.
The SELECT clause in SQL is used to specify the columns or fields that you want to retrieve from a table. It allows you to select one or more fields to include in the result set.
Option A) 1 - This option is incorrect because the SELECT clause allows you to specify more than one field.
Option B) 2 - This option is incorrect because the SELECT clause allows you to specify more than two fields.
Option C) 3 - This option is incorrect because the SELECT clause allows you to specify more than three fields.
Option D) As many as needed - This option is correct because the SELECT clause in SQL allows you to specify as many fields as needed. You can select one field, multiple fields, or even all the fields in a table by using the asterisk (*) symbol.
The correct answer is D. This option is correct because the SELECT clause in SQL allows you to specify as many fields as needed.