Explanation: The economy of mechanism is a security design principle, which supports simple and comprehensive design and implementation of protection mechanisms, so that an unintended access path does not exist or can be readily identified and eliminated. Answer: D is incorrect. Separation of duties defines that the completion of a specific sensitivity activity or access to sensitive object depends on the satisfaction of multiple conditions. Answer: C is incorrect. Psychological acceptability defines the ease of use and intuitiveness of the user interface that controls and interacts with the access control mechanisms. Answer: A is incorrect. Least privilege maintains that an individual, process, or other type of entity should be given the minimum privileges and resources for the minimum period of time required to complete a task.