Personal digital assistants are: Group of answer choices artificial intelligence systems that leverage rules or examples to perform a task in a way that mimics applied human expertise. handheld computing devices meant largely for mobile use outside an office setting. systems that provide rewards and usage incentives, typically in exchange for a method that provides a more detailed tracking and recording of customer activity. small chip-based tags that wirelessly emit a unique identifying code for the item that they are attached to. transaction processing systems that capture customer purchases.