working with a list of employees list employee lstemployees new name..., C#, .Net Technology

Question:Working with a list of Employees:List<Employee> lstEmployees = new List<Employee>
            {
                new Employee{Name="Harry",Age=15},
                new Employee{Name="Peter",Age=22},
                new Employee{Name="John",Age=45},
                new Employee{Name="Harry",Age=15},
                new Employee{Name="Peter",Age=22},
                new Employee{Name="John",Age=45},

            };
It is required to filter out employees having distinct names.
Which one of the following options cannot be used?

A public class Employee { 
 public int Age { get; set; }
 public string Name { get; set; } 
 public override bool Equals(object obj) { 
  return this.Name.Equals(((Employee)obj).Name); 
 } 
 public override int GetHashCode() { 
  return this.Name.GetHashCode(); 
 } 
} 
List<Employee> distinctEmployeesByName = lstEmployees.Distinct().ToList(); 
B public class Employee { 
 public int Age { get; set; } 
 public string Name { get; set; } 
} 

public class EmployeeEquityComparable : IEqualityComparer<Employee> { 
#region 
 IEqualityComparer<Employee> Members public bool Equals(Employee x, Employee y) { 
  return x.Name.Equals(y.Name); 
 } 
 public int GetHashCode(Employee obj) { 
 return obj.Name.GetHashCode(); 
 } 
#endregion 
} 
List<Employee> distinctEmployeesByName = lstEmployees.Distinct(new EmployeeEquityComparable()).ToList(); 
C public class Employee:IEqualityComparer<Employee> { 
 public int Age { get; set; } 
 public string Name { get; set; } 
#region 
IEqualityComparer<Employee> Members public bool Equals(Employee x, Employee y) {   return x.Name.Equals(y.Name); 
}
 public int GetHashCode(Employee obj) { 
  return obj.Name.GetHashCode(); 
 } 
#endregion 
} 
List<Employee> distinctEmployeesByName = lstEmployees.Distinct().ToList(); 
D public class Employee { 
 public int Age { get; set; } 
 public string Name { get; set; } 
} 
List<Employee> distinctEmployeesByName = (from emp in lstEmployees group emp by emp.Name into gemp select gemp.First()).ToList();

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D public class Employee { public int Age { get; set; } public string Name { get; set; } } List<Employee> distinctEmployeesByName = (from emp in lstEmployees group emp by emp.Name into gemp select gemp.First()).ToList();

C