Its A. this one is so easy for me ;)
The army doesn't use it, so that might be the answer, if it isn't sorry but I don't what else it would be.
Answer:
Input of printer - text
Output of Printer - text printed on paper
Input & output of digital Alexa - Voice/sound
Explanation:
Input for a printer is the text data entered into any of the file formats that can be printed.
Output of a printer is the text printed on a piece of paper.
Input of a digital assistant is in the form of voice
Output of a digital assistant in the form of sound
IP config. Thats assuming its not just talking about the keys on your keyboard