Matthew Has to Compose an Important E-Mail Message to a Client

Matthew has to compose an important e-mail message to a client. What advice should Matthew follow?

A) He should send only content he would want published.
B) He should write a subject line that will grab his reader's attention, even if it's not related to the message.
C) He should use emoticons, such as happy faces, to express feelings in his e-mail message.
D) He should pay one of his colleagues to write the message for him.