Which of the following is the correct syntax for using Dictionary object in your code:

using System.Collections.Generic; Dictionary < string , StringBuilder >() dctobj = new Dictionary < string , StringBuilder >;

using System.Collections.Generic; Dictionary < string , StringBuilder > dctobj = new Dictionary < string , StringBuilder >();

using System.Collections.Generic; Dictionary < string , StringBuilder > dctobj = new Dictionary < string , StringBuilder >;

using System.Text; Dictionary < string , StringBuilder > dctobj = new Dictionary < string , StringBuilder >();