Explanation:

• Inversion in temperature refers to a meteorological phenomenon in which a layer of warm air is above a layer of cooler air, instead of the usual situation where warmer air is near the surface and cooler air is higher up in the atmosphere. 

• Fog is formed when the temperature and humidity of the air reach a point where the air becomes saturated and water vapor condenses into tiny droplets.

• Advection fog can be formed as a result of a temperature inversion, where the inversion layer acts as a cap that prevents the moist air from rising and cools, causing the fog to form.

• Advection fogs that form due to temperature inversions are usually shallow and can persist for long periods of time.

Hence only statement 2nd is correct.