Answer : C, D, F

Explanation :

Option A is incorrect option because it will sort the array 'bookArray' in the ascending alphabetical order of their author.

Option B is incorrect option because it will generate the following Compilation error:
>>>>>>>
type BookComparator does not take parameters
Comparator<Book> comparator = new BookComparator<Book>();
>>>>>>>

The correct line of code is:

Comparator comparator = new BookComparator();

Option C and D are correct options. A Comparator can be defined either as an anonymous inner class or as a named inner class, within a static method.

Option E is incorrect option because the 'Arrays' class does not define method 'sortArray'.

Option F is correct option.

Option G is incorrect option because the 'Arrays' class does not define method 'sortCollection'.