Which of the Following Guidelines Should Be Followed While Writing

Which of the following guidelines should be followed while writing to international audiences?

A) Using contractions to summarize information efficiently in a document
B) Using first names in all instances instead of titles or salutations
C) Writing in the reader's language to show respect even if one is not fluent in it
D) Adjusting response time based on the nature and culture of the audience
E) Avoid spelling out the month while writing a date and instead writing in numbers