In what order is blacklist and whitelist filtering processed on a received SMTP message?

A.
DNS blacklists, DNS whitelists, private blacklists, private whitelists

B.
DNS whitelists, DNS blacklists, private whitelists, private blacklists

C.
Private blacklists, DNS blacklists, private whitelists, DNS whitelists

D.
Private whitelists, private blacklists, DNS whitelists, DNS blacklists

Explanation: