The correct answer would be, official emails and posted notices.
Official Emails and Posted Notices are examples of formal written communication.
Explanation:
People talk to each other and communicate their feelings, thoughts, expressions, likes, dislikes, views, anything, through exchanging these information either verbally or non verbally.
When people communicate their information through speaking it out, it is called as the verbal communication.
When people communicate their information non verbally, through visual cues or in the written form, it is called as the non verbal communication. Non verbal communication include communicating through gestures, facial expressions, body language, writing, touch, etc.
Official Emails and Posted Notices are the formal written letters that are the examples of formal written communication.
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