What’s the function of such poses as Sun Salutations?

Which one is formal and consistent with most of the salutations in a business letter?( ). A: Very Truly, B: Sincerely, C: Yours sincerely, D: Best regards,

What salutations would you choose to address the following people? 1. a company 2. Robert Johnson (a businessman with a doctor ’ s degree) 3. Linda Lee (marital status unknown) 4. Clifford White (a professor) 5. Mrs.Sunny Black and Mary Black 6. Mr.John Rose and his wife