The correct answer is C. Digital scanners.
A notebook computer is a portable personal computer, typically smaller than a desktop computer and designed to be easily transported. A cellular telephone is a portable telephone that uses a cellular network to make and receive calls. A personal digital assistant (PDA) is a handheld computer that is used to manage personal information, such as contacts, appointments, and to-do lists. A digital scanner is a device that converts images or documents into digital files.
A digital scanner is not a computing device because it does not have the ability to process information. It is a peripheral device that is used to input data into a computer.