Layered and static (Option D) is the most desirable approach to security.

• Perimeter security acts as a single boundary or border that protects systems from the outside world. However, a layered security approach is implemented using multiple layers or levels to protect systems while hindering a threat until it can be completely dealt with.

• Hence, it is evident that the Layered approach is much more desirable.

• Static testing is processed from the inside out of a program or application while it is not being executed. However, Dynamic testing tests from the outside while it is being executed.

• Static testing finds problems at exact locations in a much lower time and reduces the cost. However, Dynamic testing may provide false positives and false negatives and it is difficult to pinpoint problems.

• Hence, the static approach is much more desirable.

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