Final answer:
The likely and easy fix to John's problem is to enable network sharing in the Settings app.
Step-by-step explanation:
A likely and easy fix to John's problem is option a) The computer is not set to find resources shared on the network; use the Settings app to fix the problem. To do this, John can go to the Settings app in Windows 10, navigate to the Network & Internet section, and make sure network sharing is enabled. This will allow John to find and connect to the network printer.