What Should Be Accomplished in the Opening of a Request

Multiple Choice

What should be accomplished in the opening of a request for a recommendation?

A) The deadline for sending the letter should be mentioned.
B) The reader's memory of the relationship he/she had with the person referred should be triggered.
C) The full name and address of the person to whom the letter should be sent should be obvious.
D) An offer to pay for the service rendered should be included.
E) A neutral buffer statement or statements should be included.