The back end of a business database consists of:

Which of the following is not a disadvantage of trying to modify a sequential access file?

a. Modifying data can potentially destroy other data. b. It may be necessary to rewrite every record in the file to make a slight change. c. Things that are stored in the same number of “raw data” bytes internally may not take up the same amount of space in a file. d. Overwriting a record with another record of the same size is very difficult.

Suppose you create a class Square to be a subclass of GeometricObject. Analyze the following code:

``` class Square extends GeometricObject { double length; Square(double length) { GeometricObject(length); } } ``` a. The program compiles fine, but you cannot create an instance of Square because the constructor does not specify the length of the Square. b. The program has a compile error because you attempted to invoke the GeometricObject class's constructor illegally. c. The program compiles fine, but it has a runtime error because of invoking the Square class's constructor illegally.