To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) A stored procedure on the server - This option is incorrect because storing the code in a stored procedure on the server would make it accessible from multiple program units, not just the program unit ORDERTOTAL.

Option B) A block of code in a PL/SQL library - This option is incorrect because storing the code in a PL/SQL library would also make it accessible from multiple program units, not just the program unit ORDERTOTAL.

Option C) A local subprogram defined within the program unit ORDERTOTAL - This option is correct because defining a local subprogram within the program unit ORDERTOTAL ensures that the code is only accessible within that specific program unit. This means that the code for calculating discounts will only be invoked when the ORDERTOTAL program unit is called.

Option D) A block of code in the body of the program unit ORDERTOTAL - This option is incorrect because storing the code directly in the body of the program unit ORDERTOTAL would make it less modular and harder to maintain. It is better to define a separate local subprogram within the program unit for the specific code.

The correct answer is option C. This option is correct because defining a local subprogram within the program unit ORDERTOTAL ensures that the code is only accessible within that specific program unit.

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• Wrong explanation