How is warm front formation different from occluded front formation? a. a warm air mass rises above a cold air mass during a warm front, but two cold air masses surround a warm air mass during an occluded front. b. two cold air masses surround a warm air mass during a warm front, but a cold air mass moves against a warm air mass during an occluded front. c. a cold air mass moves faster than a warm air mass during a warm front formation, but a cold air mass is pushed upward during an occluded front. d. a warm air mass and a cold air mass form a boundary during a warm front, but water condenses between two air masses during an occluded front.