170下列哪些通訊協定為用來加密電子郵件?(A)SMTP(Simple Mail Transfer Protocol)(B)HTTPS(Hypertext Transfer Protocol Secu
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170下列哪些通訊協定為用來加密電子郵件? (A)SMTP(Simple Mail Transfer Protocol) (B)HTTPS(Hypertext Transfer Protocol Secure) (C)S/MIME(Secure/Multipurpose Internet Mail Extension) (D)PGP(Pretty Good Privacy)