Which of the following is a real-time internet communications service that notifies users when one or more people are online and then allows them to exchange messages or files or join a private chat room?
a. communispace
b. wikispace
c. im
d. chattalk

The correct answer to the following question will be Option C (IM).

Explanation:

IM is brief for instant messenger, a type of interaction that allows you to create a kind of chat rooms that are private with another candidate to interact in live time throughout the Internet, comparable to a phone conversation, using text-based, non-voice-based correspondence.

Hence, It's a real-time Online communication service that allows users to know when one or even more users are connected online and then lets them exchange information or documents or enter a chat room.

Therefore, Option C is the right answer.

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