Question: Please help me with these questions, i dont understand how to solve for them. 2) List and briefly define four data center availability tiers. 3)

Please help me with these questions, i dont understand how to solve for them.

2) List and briefly define four data center availability tiers. 3) Consider an SQL statement: SELECT id, forename, surname FROM authors WHERE forename = 'david' AND id = 939 a. What is this statement trying to search from the database? b. Assume that the firstname and id fields are being gathered from user-supplied input, and suppose the user responds with: Firstname: david'; drop table employees -- id: 939: What will be the effect? c. Now suppose the user responds with: firstname: 'OR 9 = 9.. id: 939 What will be the effect

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3. The training program involves multiple classes and a large number of trainees.

6. To compare the costs and benefits of training versus nontraining investments (such as work redesign or a better employee selection system).

2. The training program is ongoing and has the potential to have an important influence on (employees or customers).