B74-400 Systems question

Here is the first of a number of questions on the B747 systems which can be answered if you think about it logically.

With the Passenger Temperature Selector in AUTO and the air conditioning system operating normally, which temperature zone determines the outlet temperature of the air conditioning packs?

Air conditioning packs (small generators) as it suggests mean the air conditioning systems for the aircraft primarily at cruise Level; think about passenger comfort

Is it:
a. The zone requiring the coolest air supply
b. The zone requiring the warmest air supply
c. The warmest zone

This question is taken from an Second Officer quiz. There is one drawback which we will discuss later. Answer in approximately two hours

The answer is to my question above is 

a. The zone requiring the coolest air supply .While monitoring the various temperatures the system looks for the area requiring the COOLEST AIR SUPPLY. One of the drawbacks all model large jetlners has been that the OUTFLOW VALVE which removes stale air has never been large & efficient enough. 

This was one of the reasons passengers felt so "sleepy" on long haul flights; there was never enough oxygen within the aircraft itself.                                                                                                                                                                                                                                                                         And now go & put 3 bottles of water in the freezer overnight in preparation for tomorrow if you live in Australia & particularly NSW