Which one is a business letter and which is a friendly letter? (Letter A - left, Letter B - right) How do you identify each?

August 2, 2018 August 2, 2018 Dear Maya, Dear Miss Santos: Thank you very much for your last letter. It was I am writing to confirm my acceptance of your great to hear from you after so many years. You seem employment offer on July 23, 2018 and to tell you to be having a great time in Singapore. how enthusiastic I am to join the company. The work is exactly what I have prepared for and hoped to do. Thanks also for the photographs. I absolutely I am confident that I will be able provide an important loved that smile of yours standing before the contribution to the company and with it, I am grateful Merlion. Singapore looks beautiful. Someday, for the opportunity you have given me. would definitely like to visit it. I am looking forward to working with you and your Hope to see you soon! team. Ernie Sincerely yours, William Esteban C. Brutas