Martin Works as a Professional Ethical Hacker and Penetration Tester

Martin works as a professional Ethical Hacker and Penetration Tester. He is an ESCA certified professional and was following the LPT methodology to perform the penetration testing. He is assigned a project for information gathering on a client's network. He started penetration testing and was trying to find out the company's internal URLs, (mostly by trial and error) , looking for any information about the different departments and business units. Martin was unable to find any information. What should Martin do to get the information he needs?

A) Martin should use email tracking tools such as eMailTrackerPro to find the company's internal URLs
B) Martin should use online services such as netcraft.com to find the company's internal URLs
C) Martin should use WayBackMachine in Archive.org to find the company's internal URLs
D) Martin should use website mirroring tools such as HTTrack Web Site Copier to find the company's internal URLs