Equivalence class partitioning approach is used to divide the input domain into a set of equivalence classes, so that if a program works correctly for a value, then it will work correctly for all the other values in that class. This is used _____.

• A. To partition the program in the form of classes.
• B. To reduce the number of test cases required.
• C. For designing test cases in white box testing.
• D. all of the above.