Which of the following expressions evaluates to true when the strpart variable contains the string “12ax45”? a. strpart like "99[a-z][a-z]99" b. strpart like "" c. strpart like "##[a-z][a-z]##" d. none of the above

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)?

Anetwork security application that prevents access between a private and trusted network and other untrusted networks

Write pseudocode to represent the logic of a program that allows the user to enter a value. the program multiplies the value by 10 and outputs the result.