What is the object$-$oriented principle that enables flexible modeling in the given sequence diagram? Payment $($abstract$)$ authorized$)($abstract$)$ CreditPayment DebitPayment authorized authorize$()1$ Register Payment $($abstract$)$ dox authorize DebitPayment Foo CreditPayment :Bar authorize authorize doA dox $----$ doB Select one: a$.$ separation of concern O b$.$ overloading O c$.$ information hiding O d$.$ encapsulation O e$.$ polymorphism