What will be output

Question

using System; public class Program { public static void Main(string[] args) { Console.WriteLine(Math.Round(6.5)); Console.WriteLine(Math.Round(11.5)); } }
a) 6 12
b) 6 11
c) 7 12
d) 7 11

Answer 1

c) 7 12

Answer 2

it's 6 12

Answer 3

Can you explain how ?