Question:You are writing a method that returns an ArrayList named al. You need to ensure that changes to the ArrayList are performed in a thread-safe manner. Which code segment should you use? 

A Dim al As ArrayList = New ArrayList() 
Dim sync_al as ArrayList = ArrayList.Synchronized(al) Return sync_al 
B Dim al As ArrayList = New ArrayList() 
SyncLock al.SyncRoot.GetType() 
Return al 
End SyncLock 
C Dim al As ArrayList = New ArrayList() 
Monitor.Enter(al) 
Monitor.Exit(al) 
Return al 
D Dim al As ArrayList = New ArrayList() 
SyncLock al.SyncRoot 
Return al
End SyncLock 

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A 

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Mohammad Towhidul Islam

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