What is the result?

Given the code fragment:
Stream<List<String>> iStr= Stream.of (
Arrays.asList (“1”, “John”),
Arrays.asList (“2”, null)0;
Stream<<String> nInSt = iStr.flatMapToInt ((x) -> x.stream ());
nInSt.forEach (System.out :: print);
What is the result?
A. 1John2null
B. 12
C. A NullPointerException is thrown at run time.
D. A compilation error occurs.

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