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單項(xiàng)選擇題

10. class Line { 
11. public static class Point { } 
12. } 
13. 
14. class Triangle { 
15. // insert code here 
16. } 
Which code, inserted at line 15, creates an instance of the Point class defined in Line?() 

A. Point p = new Point();
B. Line.Point p = new Line.Point();
C. The Point class cannot be instatiated at line 15.
D. Line 1 = new Line() ; 1.Point p = new 1.Point();

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