What does using an appropriate salutation before the subject line in a formal letter demonstrate?

Correct answer: Courtesy and etiquette

A suitable salutation, such as “Sir” or “Madam,” acknowledges the recipient respectfully and follows the conventions of formal letter writing. It demonstrates courtesy and etiquette before the subject and body of the letter are presented. Noise, semantic barriers, and inappropriate channel selection are communication problems, not qualities shown by a respectful salutation.