Answer:
D. Microsoft Office.
Explanation:
People in information technology are the source and destination of the process of communication (the beginning and the end of communication). They are responsible for creating the data and also for seeking and receiving sent data.
Mobile handheld devices like mobile phones and POS are communication devices used to make and receive calls and bank transactions respectively, by users (people).
Operating systems are softwares that is a run on the network devices to manage its activities. Without it, network devices like routers and handheld devices like phone would not function.
Microsoft office is an application package that provides users with platform for creating documents.
