Briefing Zend Knowledge

Which of the following is used to encode lines starting with one dot or two dots so that the mail do

Which of the following is used to encode lines starting with one dot or two dots so that the mail
does not violate the SMTP protocol?

A.
Zend_Mail

B.
Zend_Mail_Storage_Mbox

C.
Zend_Mail_Storage_Pop3

D.
Zend_Mail_Transport_Smtp