Answer :
One of the fastest ways to build relationships online is to join a Meetup group.
What is Meetup group?
Meetup group can be defined as a group that help to build relationship online.
This meetup group enables a person to meet new people online and to join the group you need to first look for the group you like on social media and then join the group.
Therefore the correct option is D.
Learn more about Meetup group here:https://brainly.com/question/12470206
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