Which of the following physical security controls are enclosed areas with a secure door on either end?
A. Fences
B. Bollards
C. Turnstiles
D. Mantraps
Answer: D
Explanation: Mantraps are enclosed areas with a secure door on either end that allow one person at a time. They can be used to protect against piggybacking.
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Assume that at most 5 tuples in s match each tuple in r.
Compute the cost of 
using the following methods:
(a) Nested loops
(b) Block-nested loops
(c) Index-nested loops with a hash index on B in s. (Do the computation for both clustered and unclustered index.)
where r occupies 2,000 pages, 20 tuples per page, s occupies 5,000 pages, 5 tuples per page, and the amount of main memory available for block-nested loops join is 402 pages.