(By definition, a functional interface, is an interface which has only one abstract methode)
A is a Functional interface becauce it is an interface which has only one abstract method.
C is also a Functional interface becauce it is an interface which has two method but only one of these two methods is abstract.
B is not a functional interface because B got two abstract methods.
D is not a functional interface because D do not have any abstract method
E is a compilation error because the @FonctionalInterface is not applicable to method
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