A NAS device facilitates file sharing and data backup.
NAS stands for "Network Attached Storage". It a device design specially to store and manage files and within a network. It provides centralized data access and storage.
NAS is somehow considered as a specialized external hard drive.
Answer:
A modem is considered an input And output device because it sends and receives data at the same time. For example, whenever you are surfing, you send a web-page request that its info out, or output. When you receive or access web pages, which would entail an input device.
Explanation:
I'd say that the precautions that you should follow to prevent an abrasive wheel from cracking is A. all of the answers are correct: fit the wheel on the spindle, make sure the spindle speed does not exceed the maximum speed marked on the wheel, and tighten the spindle nut enough to hold the wheel in place without distorting the flange.