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Mock Question in Design Pattern

Ranch Hand
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Hi all
I faced the following question in one of the mock exam.
Can any body tell me why the answer is A. i thought it will be C.

Let's assume you are developing a web application. One of the requirements of this application is to design a flexible framework so that services can be easily added and removed without affecting existing components.

For instance, services such as logging, authentication, debugging, compressing and encoding output, etc.. should be "pluggable" without requiring changes to the core application code. Which of the following design patterns can be used in this situation?

# A) Intercepting Filter
# B) Transfer Object
# C) Business Delegate
# D) Data Access Object

* [Ans: A]
pie sneak
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One of the greatest advantages of filters is that you can add and remove them without the need to change any other code in the application.

The question also lists some of the typical uses of filters.

I'm curious as to what made you believe the answer was Business Delegate.
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