Select from options: Continue writing the next sentence.

How to use conversations in google inbox
Tap a conversation to open it.
A conversation, or " thread ", is a collection of emails based on the subject. When you send out an email, any replies you get from any of the recipients are grouped together in one conversation.

OPT: 1. Each email, however, is labelled with a secret word or phrase which indicates that it is private. Other messages that contain secret words used by all the recipients are grouped into one conversation.; 2. Likewise, if you reply to an email that you receive, a new conversation is created. A conversation is like a forum thread, where all relevant replies are kept in one location.; 3. The messages will be shifted around among recipients. If your conversation is sent this way, you'll get different response responses.; 4. The messages will now appear on your timeline and your inbox. Tap the conversation icon to launch it.;
Answer:
2.