The ____________________ command helps users of a Linux operating system temporarily switch the current privileges available to those of the root account.
Fill in the blank(s) with the appropriate word(s).
su
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Variables declared within a button's Click event handler are ____________ variables.
a. local b. String c. global d. private
Answer the following questions true (T) or false (F)
1. The virtual property is not inherited. 2. A class that has a pure virtual member function is called a concrete base class.
An array's ____ method returns an integer that indicates the highest subscript in the specified dimension in the array.
A. GetGreatestBound B. GetHighestBound C. GetUpperBound D. GetUpper
Prove that Armstrong’s transitivity axiom is sound—that is, every relation that satis?es the FDs X ? Y and Y ? Z must also satisfy the FD X ? Z .
Consider a relation r and an arbitrary pair of its tuples t , s ? r.