Can anyone help me out so that I can get shortlisted for an interview.
I have a question that they want me to answer before Monday, but not sure what to put?

Your company wants to introduce an Active Directory domain for it's ~150 users in it's main office location.
You are asked to provide some high-level, ball park IT equipment/software requirements, costs and timescales for meeting this request as they would like the work to be done in-house.

Cheers,

Season95.