Which three are necessary for antispam to function properly on a branch SRX Series device?

Which three are necessary for antispam to function properly on a branch SRX Series device? (Choose three.)

A.
an antispam license

B.
DNS servers configured on the SRX Series device

C.
SMTP services on SRX

D.
a UTM profile with an antispam configuration in the appropriate security policy

E.
antivirus (full or express)