Question:Refer to the following statements and identify the lines that are invalid: 1. <%@ Service Class="TestClass" Language="C#" %> 2. using System; 3. using System.Web.Service; 4. public class TestClass { 5. [WebMethod] 6. public int Add( int a, int b) 7. { 8. return a+b; 9. } 10. } 

A line 1 

B line 2 

C line 3 

D line 4 

E line 5 

F All of these 

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