What is one method through which iodine is applied for fingerprinting?

Iodine is a commonly used reagent for developing latent fingerprints due to its ability to adhere to the lipids and oils present in skin secretions. The correct answer encompasses all methods mentioned.

The Fuming Gun Method involves heating iodine crystals, which then sublimate and disperse iodine vapors that can develop fingerprints on surfaces. This method allows for controlled application and can be particularly useful in field conditions.

The Fuming Cabinet Method also utilizes the sublimation of iodine, but in a contained environment where pieces can be placed inside the cabinet to be saturated by iodine vapors. This method ensures even exposure and is ideal for more delicate items.

The Solution Method entails dissolving iodine in a solvent, which can then be applied directly to the surface where fingerprints are suspected. This can be particularly useful for certain surfaces where fuming isn’t effective.

Each of these methods has its unique advantages and applications, making the option of "All of the above" the most appropriate choice, as it recognizes the versatility of iodine in latent print development across different techniques.