Answer Happy

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static void Main(string[] args) { Console.WriteLine("Enter a letter:"); char c = (char)Console.Read(); if (Char.IsDigit(c) == true) Console.WriteLine("A number"); else if (char.IsLower(c) == true) Console.WriteLine("A lowercase letter"); else if (char.IsUpper(c) == true) Console.WriteLine("An uppercase letter"); Console.ReadLine(); } a. Enter a letter : a An uppercase letter b. Enter a letter : A An uppercase letter c. Enter a letter : 2 A number d. Enter a letter : 2 A lowercase letter.
a) a, b, c
b) b, c, d
c) a, d, b
d) b, c