To protect the internal components of a computer system, data integrity, and protection against external codes accessing the control of computer hardware, operating system can create different "defense" or "protection" mechanisms. name and briefly explain the three methods discussed in our class.

When you reach a yield sign, yield to cross traffic and before you enter the intersection. a. flash your headlights b. wait for a signal c. wait five seconds d. wait for a safe gap

Acompany is inviting design for its new corporate logo from its users. this is an example of ? a. crowdfunding b. crowdvoting c. crowdsourced design d. crowdtracking

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)?