Answer:
Simple Mail Transfer Protocol (SMTP) is the standard protocol for sending emails across the Internet.
Answer:
C. org
Explanation:
org is an open domain so anyone is allowed to register a .org domain
Answer:NULL Scan
Explanation:RFC 793(Request for comments) is a type of RFC command labeled with the number 793 which can operate with the TCP protocol.They are sort of document form which is from IETF( Internet Engineering Task Force ).
The null scan is scanning protocol used by legal as well as illegal hackers for working in the transfer control protocol architecture. It is used for the identification of the the ports and holes in TCP servers.they can also have the negative impact if used by the illegal hackers.
It's voice phishing but it's also sometimes referred to as vishing
