which of the following code samples will create a comma separated list..., C#, .Net Technology

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Question:Which of the following code samples will create a comma separated list from IList<string> or IEnumerable<string>?

A ublic static T[] ToArray(IEnumerable<T> source) {
 return new List<T>(source).ToArray();
 }
IEnumerable<string> strings = ...; 
string[] array = Helpers.ToArray(strings);
string joined = string.Join(",", strings.ToArray()); 
string joined = string.Join(",", new List<string>(strings).ToArray()); 
B List<string> ls = new List<string>(); 
ls.Add("one"); ls.Add("two"); 
string type = string.Join(",", ls.ToArray()); 
C string commaSeparatedList = input.Aggregate((a, x) => a + ", " + x) 
D public static string Join(this IEnumerable<string> source, string separator) { 
return string.Join(separator, source); 
}

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Question:Which of the following code samples will create a comma separated list from IList<string> or IEnumerable<string>?

A ublic static T[] ToArray(IEnumerable<T> source) { return new List<T>(source).ToArray(); } IEnumerable<string> strings = ...; string[] array = Helpers.ToArray(strings); string joined = string.Join(",", strings.ToArray()); string joined = string.Join(",", new List<string>(strings).ToArray());

B List<string> ls = new List<string>(); ls.Add("one"); ls.Add("two"); string type = string.Join(",", ls.ToArray());

C string commaSeparatedList = input.Aggregate((a, x) => a + ", " + x)

D public static string Join(this IEnumerable<string> source, string separator) { return string.Join(separator, source); }

B