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Answer:

A warm air occlusion or occluded front is less common than a cold occlusion. A warm occlusion occurs as cool air moves rapidly into an area with an existing warm front. The difference from a cold occlusion is that the approaching cool air is not as cold as the retreating cold air in the existing front.

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The answer is your second option. As an occluded front passes the air is typically drier. During a cold front, as cool air moves in an area, warm, less dense air is pushed above cooler more dense cold air causing temperatures to be colder near the ground.