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

CompanyXYZ 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 CompanyXYZ. The employee of CompanyXYZ 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 CompanyXYZ receives your email message.

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