Which of the Following Is a Salutopening

Multiple Choice

Which of the following is a salutopening?

A) Thank you, Professor Milford,
For your prompt response.
B) Dear Esteemed Professor Milford,
It has come to our attention that you are interested in joining our research team in Winslow, Arizona. We think you can be a good fit!
C) Dear Professor Milford:
D) Attention: Professor J. J. Milford