Personal Digital Assistants Are

Personal digital assistants are:

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