This proves that Company XYZ's email gateway doesn't prevent what?

This proves that Company XYZ’s email gateway doesn’t prevent what?

Company XYZ has asked you to assess the security of their perimeter email gateway. From your office in New York, you craft a specially formatted email message and send it across the Internet to an employee of Company XYZ. The employee of Company XYZ is aware of your test.

Your email message looks like this:

From: [email protected]

To: [email protected]

Subject: Test message

Date: 4/3/2017 14:37

The employee of Company XYZ receives your email message.

This proves that Company XYZ’s email gateway doesn’t prevent what?
A . Email Phishing
B . Email Masquerading
C . Email Spoofing
D . Email Harvesting