Question: What is output by the following code? ArrayList < Integer > a = new ArrayList < Integer > ( ) ; ArrayList b = a;

What is output by the following code?
ArrayList < Integer > a = new ArrayList < Integer >();
ArrayList b = a;
a.add(4);
b.add(5);
a.add(6);
b.add(7);
System.out.println(b.get(2));

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