Which of the following best describes the distribution mix? a: a network independent companies through which a product passes from produced to end user. b: the combination of distribution channels by which a firm gets its products to end users. c: an individual or firm that to distribute a product. d: an intermediary who sells products to other businesses for resale to final customers.

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.