Which of the following statements correctly identifies what has happened?

An iPhone application identifies and counts all purchases of a particular product from a shopping website. The application incorrectly counts purchase attempts by including both failed attempts, and also those where the purchase was terminated by the user before completion. Testing has identified that the problem was located in the ‘purchase identification’ module, where the first stage in the purchasing process was counted, rather than a successful confirmed purchase.

Which of the following statements correctly identifies what has happened? [K2]
A . The application failed because of a defect in the purchase identification module caused by a programmer mistake or an error in the specification.
B . An error by the programmer led to a mistake in the purchase identification module and this caused a defect in the application
C . A defect in the purchase identification module caused by a mistake in the module specification led to a defect in the overall application
D . A bug in the purchase identification module caused a fault in the application

Answer: A