Which of the following is/are blog formatting best practices?

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Which of the following is/are blog formatting best practices?
  A)  Posts should be 400-600 words in length.
  B)  Posts should include subheads and bold text where appropriate.
  C)  Posts should fill in whitespace using text and images
  D)  All of the above
  E)  Amplifying Your Content with Social Media
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.