Answer:
The oldest malware vector was emails.
Explanation:
Websites were not widespread early on into the internet, however it was very easy to have a virus that uses an email contact list, where it can send itself to other email addresses and spread.
3 Examples of mainframe computers
z900
System z9
System z10
It's voice phishing but it's also sometimes referred to as vishing
The answer might be wrong and you could get caught
