Which type of front occurs when cold air and warm air are next to eachother, but are at a stand still?

A. Occluded front

B. Stationary front

C. Warm front

D. Cold front

The answer is; B

In such kind of a front, of the two air masses that have met, neither is strong enough to displace the other. Therefore, the front persists in the same area for an extended period of time. This is unlike cold and warm fronts whose leading edges move in a particular direction while that of the occluded front spins cyclically.