In designing the Account class for a banking application, how do you ensure security and maintainability using encapsulation and abstraction$?$ Encapsulation safeguards the internal state, while abstraction encapsulates data and methods within subclasses for varied implementations. Encapsulation protects data by defining abstract methods, while abstraction hides account$-$specific details within private methods Encapsulation bundles data and methods, while abstraction allows for common methods in the abstract Account class and specific implementations in subclass Encapsulation separates data and methods, while abstraction utilizes inheritance for specialized implementations in subclasses.