you are a junior network technician for a small consulting firm. your team recently split the network into smaller subnets, one for each department. one of your users, jaclyn in hr, is trying to access shared files from tom's computer in the sales department. jaclyn states she was able to previously access these files. as part of your troubleshooting, you verify that both tom and jaclyn can access the network printer in their departments. which of the following would be the most likely reason jaclyn is unable to access files on tom's computer?