Final answer:
The Turing test, Eliza, and ChatGPT all have AI features that involve mimicking human conversation and natural language processing.
Step-by-step explanation:
The common AI features of the Turing test, Eliza, and ChatGPT are their ability to mimic human conversation and engage in natural language processing.
The Turing test, proposed by Alan Turing, involves a human judge interacting with both a machine and a human through a text-based interface and trying to determine which is which.
Eliza, created in the 1960s, was one of the earliest natural language processing programs and simulated a conversation with a Rogerian psychotherapist. ChatGPT, on the other hand, is a modern AI model developed by OpenAI that uses deep learning techniques to generate human-like responses in conversation.