Upgrade to Java SE 8 OCP ( Java SE 6 and all prior versions) (1Z0-813)

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Which is a valid functional interface?

public interface Useful { E getStuff(); void putStuff(E e); }
public interface Useful { void doStuff(); default void doOtherStuff() {} }
@FunctionalInterface public interface Useful{ default void doStuff(){} }
public interface Useful { abstract void doStuff(); abstract void doCalc(); }

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