Thank you gents. VERY helpful. Esp. the "wags".

So if I am understanding all correctly....

If you hold a constant Mach during climbout, what happens to TAS, IAS, and
AOA as you approach your level-off altitude?
a) TAS increases, IAS decreases, AOA increases
b) TAS increases, IAS decreases, AOA decreases
c) TAS decreases, IAS decreases, AOA increases
d) TAS decreases, IAS decreases, AOA increases

B is the correct answer

?