Due to the phenomenon of refraction of radio: waves in the atmosphere, which of the following effect is observed ?

• A. Radio horizon distance is more than the optical horizon distance.
• B. Radio horizon distance is less than the optical horizon distance.
• C. It all depends upon the weather conditions, Any one of the above choice may be true depending upon . type of weather.
• D. Radio horizon and optical horizon are always same because both radio waves and optical waves are electromagnetic in nature,