Question

Which is the correct combination of protocol and its standard port number for SMTP?

A SMTP uses port 25 for server-to-server email transfer
B SMTP uses port 110 for receiving email from server to client
C SMTP uses port 143 for IMAP-based email retrieval
D SMTP uses port 80 for email transmission over HTTP
E SMTP uses port 443 for secure email over HTTPS
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