試題詳解

16 有一字串如下：Received: from mail174.nps.gov (202.61.254.180) by mail174.nps.gov (202.61.254.180) with Microsoft SMTP Server (TLS) id 11.0.123.7; Fri, 20 Nov 2015 14:10:55 +0800，試問 SMTP 指的是什麼？
(A) Simulation Mail Transfer Protocol
(B) Syntax Mail Transfer Protocol
(C) Simple Mail Transfer Protocol
(D) System Mail Transfer Protocol