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AP Computer Science A· difficulty 3/5

public class Animal {
    private String name;
    private int legs;
    public Animal() { this("unknown", 4); }
    public Animal(String n, int l) {
        name = n;
        legs = l;
    }
    public int getLegs() { return legs; }
}
// ...
Animal a = new Animal();
System.out.println(a.getLegs());

What is printed?

A
$4$
check_circle
B
$0$
C
$unknown$
D
$Compile-time error$

Explanation

The default constructor calls this("unknown", 4), which sets legs to 4.

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