Another question :::
Q. Under which of the following conditions can the fifth (last) parameter of the mail function, called $additional_parameters, be used?
A. Both when sending e-mail from UNIX and Windows/Novell
B. Only when sending e-mail from Windows/Novell to provide SMTP commands to the MTA
C. Only in conjunction with the sendmail application or a wrapper application specified by sendmail_path
D. This parameter is deprecated and is no longer used in PHP
what is the correct answer of this ?