One encryption method made popular by spy movies involves using the text in a book as the key to decrypt a message.

• there are m points and K clusters, • half the points and clusters are in “more dense” regions, • half the points and clusters are in “less dense” regions, and • the two regions are well-separated from each other.

Suppose that for a data set • there are m points and K clusters, • half the points and clusters are in “more dense” regions, • half the points and clusters are in “less dense” regions, and • the two regions are well-separated from each other. (a) Centroids should be equally distributed between more dense and less dense regions. (b) More centroids should be allocated to the less dense region. (c) More centroids should be allocated to the denser region. Note: Do not get distracted by special cases or bring in factors other than density. However, if you feel the true answer is different from any given above, justify your response.

?The _____ method diminishesarrayfrom the last element by keeping only those items that return a value oftruefrom thecallbackfunction.

A. ?array.every(callback [, thisArg]) B. ?array.map(callback [, thisArg]) C. ?array.reduceRight(callback [, thisArg]) D. ?array.findIndex(callback [, thisArg])