Match the following terms with their meanings:
I. data validation
II. validation rule
III. input mask
IV. lookup field
A. enables you to restrict the data being input into a field by specifying the exact format of the data entry
B. restricts the data values that can be entered into a field
C. provides the user with a finite list of values to choose from in a menu
D. a set of constraints or rules that help control how data is entered into a field
D, B, A, C
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Answer the following statement true (T) or false (F)
Which of the following statements about semaphores is true?
a) P and V operations should be indivisible operations. b) If several threads attempt a P( S ) operation simultaneously, only one thread should be allowed to proceed. c) A semaphore implementation should guarantee that threads do not suffer indefinite postponement. d) all of the above