[Solved] Which of the following tools and concepts is useful in the analysis of international trade? A)total surplus B)domestic supply C)equilibrium price D)All of the above are correct. Child Pornography: The illegal creation, distribution, or possession of explicit images or videos of minors, which is a serious criminal offense worldwide. Network Wiring Closet: A small room or enclosure where network and telecommunications equipment are centralized, including switches, routers, and patch panels, for managing the wired network. Tailgating: A breach of physical security that occurs when an unauthorized person enters a secure space behind an authorized person. Training and diligence by all employees are the only ways to stop tailgating. Mantrap: A method of separating a nonsecure area from a secure area to prevent unauthorized access and tailgating.