In the context of Gaussian Plume Dispersion model assumptions, consider the following statements :
(a) The pollutants have the same density as the air surrounding them.
(b) The atmosphere is stable.
[A] Both (a) and (b) are true
[B] (a) is true, (b) is false
[C] (a) is false, (b) is true
[D] Both (a) and (b) are false