You have configured a UTM profile called Block-Spam, which has the appropriate antispam configuration to block undesired spam e-mails.Which configuration would protect an SMTP server in the dmz zone from spam originating in the untrust zone?（）
A. set security policies from-zone dmz to-zone untrust policy anti-spam then permit application- services utm-policy Block-Spam
B. set security policies from-zone untrust to-zone dmz policy anti-spam then permit application- services utm-policy Block-Spam
C. set security policies from-zone untrust to-zone dmz policy anti-spam then permit application- services anti-spam-policy
D. set security policies from-zone untrust to-zone dmz policy anti-spam then permit application- services Block-Spam
正确答案：参考B
