Final answer:
Neural nets are characterized by their ability to mimic the human brain's functioning. They are a type of artificial intelligence designed to simulate human intelligence and reasoning, and use a structure similar to biological neurons to solve problems and make decisions.
Step-by-step explanation:
The characteristic of neural nets that is being asked about is: d. They mimic the way a human brain works. Neural nets, also known as neural networks, are a facet of artificial intelligence (AI) which effectively define artificial intelligence as "the simulation of human intelligence by machines programmed to mimic human thought and actions". These sophisticated systems draw inspiration from the biological network of neurons in the human brain, allowing them to process information and learn in a manner that is reminiscent of how humans think and learn.
AI can be categorized into various types, including reactive machines, limited memory, theory of mind, and self-aware AI. Neural nets rely on a structure consisting of layers of nodes, or "neurons," which help them use heuristics to solve complex problems and use cognitive skills to make decisions, similar to our own biological neurons that are capable of multitasking, as demonstrated in scientific studies such as with the C. elegans worm.