public static string Concat(string str0, string str1)
a) method returns a string
b) string str1 is concatenated to the end of str0
c) can be used to concatenate any number of strings
d) all of the mentioned
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d
Explanation: This method returns a string that contains str1 concatenated to the end of str0. Another form of Concat(), shown here, concatenates three strings:
public static string Concat(string str0, string str1, string str2). Hence, any number of strings can be concatenated using this method.