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.

A. a, b, c

B. b, c, d

C. a, d, b

D. b, c

Answer: Option D