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A developer has created a string array variable as shown below:
UserNames = {"Jane", "Jack", "Jill", "John"}
Which expression should the developer use in a Log Message activity to print the elements of the array separated by the string ","?
String.Concat(UserNames,",")
String.Concat(",", UserNames)
String.Join(UserNames,",")
String.Join(",", UserNames)
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