What is the function of the subject heading in a letter of complaint?

AIt gives the reader a quick understanding of the letter's topic.
BIt helps the mailroom clerk sort the letter into the proper pile.
CIt helps the writer deliver the message more efficiently.
DIt serves no real function. It's just a convention of a business letter.

Verified Answer :

The official function of the subject heading in a letter of complain to a person or business is to give the reader a quick understanding of the letter's topic.

The official function of the subject heading in a letter of complaint to a person or business is to give the reader a quick understanding of the letter's topic.

The use of subject heading simplifies the work of the particular authority to whom the letter is sent. the importance of a particular letter can be easily analyzed by taking a glance over its subject as the people in the authorities judge the importance of a letter by reading it. it also helps to take quick action against the complaint.