Which of the following are valid functional interfaces? (Choose two.) A. interface CanClimb { } B. interface

Which of the following are valid functional interfaces? (Choose two.) 

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A. interface CanClimb { } B. interface CanDance { } C. } interface CanFly { D. default void climb() {} static void climb (int x) {} } E. int dance() { return 5; } interface CanRun { void run(); static double runFaster() {return 2.0; } } abstract void fly(); interface CanSwim { abstract Long swim(); boolean test();