Question: We found that the following line throws a NullPointerException: String studentName = students [ 5 ] [ 1 ] . toUpperCase ( ) ; At

We found that the following line throws a NullPointerException:
String studentName = students[5][1].toUpperCase();
At most, how many references/return values in this line could be null and might cause the NullPointerException to be thrown?

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