To answer this question, you need to understand the concept of declaring variables based on definitions of columns in a table.
Option A) %ROWTYPE - This option is incorrect because the %ROWTYPE attribute is used to declare a record variable that has the same structure as a row in a table or a cursor. It is not used to declare variables based on definitions of columns in a table.
Option B) %TYPE - This option is correct because the %TYPE attribute is used to declare variables based on the data type of a column in a table. By using %TYPE, you can ensure that the variable has the same data type as the column, making it easier to work with the data.
Option C) AS_COLUMN - This option is incorrect because there is no attribute called AS_COLUMN in Oracle SQL.
Option D) None of the above - This option is incorrect because option B, %TYPE, is the correct answer.
The correct answer is B) %TYPE. This option is correct because the %TYPE attribute is used to declare variables based on the data type of a column in a table.