Answer: C) Real-time editing
Explanation: Real-time editing is when two or more people work on thesame document live and simultaneously, this means that each user is able to work on thesame piece of document right from their individual devices at the same time with automatic and instant merging of their individual input. Google uses this feature in Google docs; which allows one to share notes and research with other users allowing them to work on the document from their individual devices live and simultaneous.
