What is the benefit of a cloud computing infrastructure? ○ companies have full control over the data that is hosted. ○ companies need to pay for only the resources used. ○ companies can host all applications internally on their own servers. ○ companies do not need to worry about the security of hosted data.

Implement a document scanning function wordcountengine, which receives a string document and returns a list of all unique words in it and their number of occurrences, sorted by the number of occurrences in a descending order. if two or more words have the same count, they should be sorted according to their order in the original sentence. assume that all letters are in english alphabet. you function should be case-insensitive, so for instance, the words “perfect” and “perfect” should be considered the same word.