Option 4 is the correct answer for the above question.
Explanation:
"Authorization memo" is a type of letter which is providing to anyone when a person wants to authorize a person to do any work. For example, if a person wants to authorize another person to use his id and the password to log on the internet, then he can do it by providing the authorization letter to him. this letter is known as an authorization memo.
The above question scenario said to take the authorization letter from the CEO. so the letter is known as an authorization memo. Hence option 4 is the correct answer while the other is not because-
Option 1 states about Syslog which is log file states about the system error.
Option 2 states about the network flow which is not the correct answer.
Option 3 states about the certificate authority which is used for the certificate.
