I just sat the CMET exam today and sadly got 63% mainly due to my rushed studies (I am planning to slam through at least four of the CPL exams by next year). I had strong stomach ache in the morning and could only relieve it during the exams.

Anyway there was this question that bothered me because I don't recall ever seeing anything like it in the BT Meteorlogy book aside from the images of a fast moving cold front.
I don't recall the question word for word but the basic concept was something like this with the exact words "forward flank" and "rear flank" and it didn't specify any other context:

Regarding the [i]forward flank[/i] and the [i]rear flank[/i] the air masses near a thunderstorm are:
-forward flank is hot and moist, rear flank is cool and dry
-forward flank is hot and dry, rear flank is cool and moist
-forward flank is cool and dry, rear flank is warm and dry
-forward flank is cool and moist, forward flank is warm and moist

The answer selection was something like that.

I initially didn't know what they meant by flank but I assumed they meant something like forward flank -> in front of where the thunderstorm is travelling
I asked a few people around and they said the front flank is warm and moist, rear flank is cool and dry. That's what I think I picked because although the question doesn't specify a moving cold front or anything similar context I just assumed so.

Also, is an inversion "strongest" at midnight or at sunrise? I am unsure if I got that correct since the KDR feedback is ambiguous as it only gives a topic, as many questions involve such topic.