Answer:
All the information which he can gather about the prospective employer.
Step-by-step explanation:
It is very important to understand prospective employer for a successful interview. Thomas understands that before the interview he must collect all the relevant information about the prospective employer to give an effective interview. The information should include the position of employers, nature, dislikes, Career, social life, etc. The relevant information helps in the interview because it gives a competitive edge over other candidates.