In technology, the hashing approach transforms the character into the other values. It is guaranteed to provide O(1) storage and retrieval of keys. Thus, option C is correct.
A hashing approach is a programming technique that is used to convert the range of the key values into the indexes and is majorly used in the hash tables.
The hash functions take the O(1) and retrieve making them fast to work with. It always does not necessarily work if the keys are integrated and are also is not much space sufficient.
Therefore, the option C. hashing approach is a guaranteed technique.
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