Given:
2. class Animal { }
3. class Dog extends Animal { }
4. class Cat extends Animal { }
5. public class Mixer＜A extends Animal＞ {
6. public ＜C extends Cat＞ Mixer＜ super Dog＞ useMe(A a, C c) {
7. //Insert Code Here
8. } }
Which, inserted independently at line 7, compile (Choose all that apply.)

多项选择题Given:2. public class Buffalo {3. static int x;4. int y;5. public static int getX() {return x; }6. public static void setX(int newX) {x = newX; }7. public int getY() {return y; }8. public void setY(int newY) {y = newY; }9. }Which lines of code need to be changed to make the class thread safe (Choose all that apply.)

多项选择题Given:1. class MyClass { }And given that MyClass2 has properly overridden equals() and hashCode() objects from which classes make good hashing keys (Choose all that apply.)