Which part of the letter needs revision in order to be appropriate for a formal letter? the salutation the body the closing the signature ASAP

Which sentence is written correctly? mrs. ellis, a petite woman, wore the finest dresses from paris. mrs. ellis a petite woman, wore the finest dresses from paris. mrs. ellis, a petite woman wore the finest dresses from paris. mrs. ellis a petite woman wore the finest dresses from paris.