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Which operator is used to check whether the expression is "NULL"?

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Which of the following conditions are true in the following C# code? 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. The non handle array representing a row of values is . . . . . . . . Which of this method is used to make all elements of an equal to specified value? Which element specifies a list of pre-defined options for an input element? What happens to the thread when garbage collection kicks off?