What is an online recommendation engine?
A. An online recommendation
engine is a set of software
algorithms that uses past user data
and similar content data to make
recommendations for a specific user
profile.
B. An online recommendation
engine is a set of search engines that
uses competitive filtering to
determine what content multiple
similar users might like.
C. An online recommendation
engine is a way of tracking a user's
online behavior and deciding what
similar products and content they
might like based on their offline
behavior
D. Both A and C

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

Identify the publisher in this citation: carter, alan. a guide to entrepreneurship. new york: river’2008.print.

What is not a type of text format that will automatically be converted by outlook into a hyperlink?