Here are the answers to your questions:
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Netiquette – The supervisor should address netiquette with the coworker, as their rude and inappropriate comments violate acceptable online behavior.
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Don't use emojis – This is not a rule of netiquette. Using emojis can be acceptable in many contexts as long as they're appropriate.
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Using conferencing software – This weapon is most likely to be helpful for a company wanting to improve how its employees use live audio and video collaboration software.
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Timeline – The document that indicates when each part of a project should be finished is an example of a timeline.
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Search folder – While "tags" could help organize emails, the "Search folder" would be the most helpful for finding specific emails in Gmail if the user needs a reminder of details from past emails. However, it seems the option may be misstated; if "search" was meant to be an option, that would be the best choice. Otherwise, using the "drafts folder" could also provide previous emails written but is not the most effective solution for reminders.
If needed, please adjust the terminology based on your application or the available features in Gmail.