How is a warm front different from a cold front?

a. Warm fronts cause snow flurries in the winter, while cold fronts cause several days of rainy weather.
b .Warm fronts cause rapid changes in weather, while cold fronts cause several days of cloudy weather.
c. Warm fronts cause several days of cloudy weather, while cold fronts cause heavy snow in the winter.
d. Warm fronts cause thunderstorms in the summer, while cold fronts cause rain when the air is humid.