• Card 21 / 24: In your web application you decided to use Javascript to validate each user input on the client browser. Where do you need to duplicate the validation code on the server?
    A) No double check on the server side is needed as the input is already checked on the client side
    B) double check in the presentation tier
    C) double check in the integration tier
    D) double check in the business tier

    Answer:
    D) double check in the business tier

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Explanation:

You always need to double check the user input as it not guaranteed that user is actually using the intended interface as you planned.

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Enterprise Java Design Patterns

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