Answer: B. for every single piece of self-promotional content posted, share four pieces of content from others.
Explanation: The 4-1 rule states that for every single piece of self-promotional content posted, share four pieces of content from others. The rule is applied to the structuring of social media content as it helps achieve an ideal ratio of original posts, engagement and self-serving posts for a business. As a result, it ensures a balance is struck between promoting one's own business and the use of social media in connecting with others.