$1.$ What do you know about Expert systems? Is it true: otherwise known as knowledge$-$based systems, these use artificial intelligence $($AI$)$ to solve complex problems. They are systems that emulate the decision$-$making ability of a human expert$\mathrm{.}2.$ What do you know about Inference engines? Is it true: a computer program that tries to derive answers from a knowledge base. It is the brain that expert systems use to reason about the data in the knowledge base for the ultimate purpose of formulating new conclusions$\mathrm{.}3.$ What do you know about rule$-$based programming? Is it true: a common way of developing expert systems, with rules based on if$-$then logic units, and specifying a set of actions to be performed for a given situation$\mathrm{.}4.$ What do you know about artificial neural networks