Consider the following code snippet:

    public class Employee
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Department { get; set; }
    }

        static void Main(string[] args)
        {
            List<Employee> empTree = new List<Employee>();
            empTree.Add(new Employee { FirstName = "James", LastName = "Cameroon", Department = "IT" });
            empTree.Add(new Employee { FirstName = "Tom", LastName = "Hanks", Department = "Marketing" });
            empTree.Add(new Employee { FirstName = "Brad", LastName = "Pitt", Department = "IT" });
            empTree.Add(new Employee { FirstName = "Tom", LastName = "Cruise", Department = "Sales" });
            empTree.Add(new Employee { FirstName = "Angelina", LastName = "Jolie", Department = "Sales" });
            empTree.Add(new Employee { FirstName = "Leonardo", LastName = "DiCaprio", Department = "Marketing" });

           // LINQ query missing here

            foreach (var dept in employeesByDept)
            {
                Console.WriteLine("Department: {0}", dept.Key);
                foreach (var emp in dept)
                {
                    Console.WriteLine("\t{0} {1}", emp.FirstName, emp.LastName);
                }
            }
      }

What is the appropriate LINQ query to be written inside the Main() method, to produce the following output?

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