Suppose the library uses an efficient online system to search for the books. The book names are stored in an appropriate data structure, along with its authors, editions, publisher etc. Library users search for a book by providing the title. The system picks the key words and displays the result. For example "algorithm" word may display many titles such as "data structures & algorithms", "complexity of algorithms", "writing algorithm in C++* etc. What is the best data structure for this scenario. Justify your answer.