Which of the following is the best example of method overriding?

a$)$ A method has alternate execution depending on its input parameters.

b$)$ A superclass has int calculateAre$($int x$,$ int y$)$ method defined, the subclass has a method called areal that calls super.calculateAreaint x$,$ int y$).$

c$)$ A superclass has int calculateAreaint x$,$ int y$)$ defined, the subclass also defines String calculate Areaint x$,$ int y$).$

d$)$ A superclass has int calculate Areaint x$,$ int y$)$ defined, the subclass also defines int calculateAreaint x$,$ int y$).$