Which one of the following points should be kept in mind while selecting the site for a rain gauge station?

• A. The site where a rain gauge is set up should be close to a meteorological observatory.
• B. The rain gauge should be on the top of a hill.
• C. A fence, if erected to protect the rain gauge from cattle etc. should be located within twice the height of the fence
• D. The distance between the rain gauge and the nearest object should be at least twice the height of the object.