The correct answer is D. Principle 4.
Principle 1 states that the system should be reliable. This means that the system should be able to perform its intended function without failing. Principle 2 states that the system should be secure. This means that the system should be protected from unauthorized access, use, disclosure, disruption, modification, or destruction. Principle 3 states that the system should be efficient. This means that the system should use resources in a way that minimizes costs and maximizes performance. Principle 4 states that the system should be usable. This means that the system should be easy to use and understand.
Principle 4 is the odd man out because it is the only principle that is not directly related to the system’s ability to perform its intended function. The other three principles are all directly related to the system’s ability to perform its intended function.
Principle 1 is related to the system’s ability to perform its intended function because a reliable system is one that is able to perform its intended function without failing.
Principle 2 is related to the system’s ability to perform its intended function because a secure system is one that is protected from unauthorized access, use, disclosure, disruption, modification, or destruction.
Principle 3 is related to the system’s ability to perform its intended function because an efficient system is one that uses resources in a way that minimizes costs and maximizes performance.
Principle 4 is not directly related to the system’s ability to perform its intended function because a usable system is one that is easy to use and understand. However, a usable system is still important because it can make it easier for users to interact with the system and achieve their goals.