you are developing a routine that will periodically perform calculation based on..., Basic, Microsoft .NET Framework

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Question:You are developing a routine that will periodically perform a calculation based on regularly changing values from legacy systems. You write the following lines of code. 
01 Dim exitLoop As Boolean = False
02 Do 04 exitLoop = PerformCalculation()
05 Loop While Not exitLoop
You need to write a code segment to ensure that the calculation is performed at 30-second intervals.
You must ensure that minimum processor resources are used between the calculations. Which code segment should you insert at line 03?

A Thread.Sleep(30000); 
B Thread.SpinWait(30); 
C Thread.SpinWait(30000); 
D Dim thrdCurrent As Thread = Thread.CurrentThread;
thrdCurrent.Priority = ThreadPriority.Lowest; 
E Dim thrdCurrent As Thread = Thread.CurrentThread; 
thrdCurrent.Priority = ThreadPriority.BelowNormal;

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A Thread.Sleep(30000);

B Thread.SpinWait(30);

C Thread.SpinWait(30000);

D Dim thrdCurrent As Thread = Thread.CurrentThread;thrdCurrent.Priority = ThreadPriority.Lowest;

E Dim thrdCurrent As Thread = Thread.CurrentThread; thrdCurrent.Priority = ThreadPriority.BelowNormal;

A

D Dim thrdCurrent As Thread = Thread.CurrentThread;
thrdCurrent.Priority = ThreadPriority.Lowest;

E Dim thrdCurrent As Thread = Thread.CurrentThread;
thrdCurrent.Priority = ThreadPriority.BelowNormal;