Given:

What is the result?

• A.The code fails to compile. To make it compile, at line n1 insert:
  this () { }
• B.The code fails to compile. To make it compile, at line n2 insert:
  this ();
• C.The code fails to compile. To make it compile, at line n1 insert:
  Bus () { }
• D.The code compiles and prints:
  default

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