What does each of the following statements display? Provide the answers to the following questions:

what's the output?

a. System.out.println( 15 / 4 );

b. System.out.println( 15.0 / 4 );

c. System.out.println( (int) 15.0 / 4.0 );

d. System.out.println( (int) (15.0 / 4.0 ));