Brings a large amount of rain and snow a) cyclone b) anticyclone c) cold front d) warm front e) stationary front f) occluded front

The occluded fronts are formed when a cold front, moving faster, traps a warm front and fuses. Thus the two cold air masses, those of the warm front and those of the cold, come into contact and remain in the lower part, being denser. The warm air is forced to rise, cools and causes intense rainfall. Once above, cooling continues by contact with cold air.

a is the answer i believe.