What is the output of the following code?
```
public class Test {
public static void main(String[] args) {
java.math.BigInteger x = new java.math.BigInteger("3");
java.math.BigInteger y = new java.math.BigInteger("7");
x.add(y);
System.out.println(x);
}
}
```
a. 3
b. 4
c. 10
d. 11
a. 3
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Fill in the code below in the underline:
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