I am trying to generate a report on overdue tasks.

(a) The project plan has been rebaselined 3 times. If I run the late tasks report from MSP, will it use the last rebaselined plan as reference or something else to run the late report?
(b) The project status date. I understand I can use the current date to generate a late tasks report. However, is it more meaningful to generate tasks with the current rebaselined plan's Go Live date as the project status date? What I am trying to get is that we need to know all the tasks that are delayed in the project, due to the current delays. How do I get that?