In a diagram illustrating the air masses on either side of a Polar Front, where is the CP air (warmer and more humid) and where is the MT air (colder and less humid)?
Select one:

a.
The CP air is behind the front while the MT air is ahead of the front.

b.
The CP air is ahead of the front while the MT air is behind the front.

c.
The CP air and MT air are both behind the front.

d.
The CP air and the MT air are both ahead of the front.