Given the following class diagram, which two classes are missing in the hierarchy at positions 1 and 2? 

A. IOException at position 1, Exception at position 2

B. Exception at position 1, RuntimeException at position 2

C. IllegalArgumentException at position 1, RuntimeException at position 2

D. IllegalStateException at position 1, RuntimeException at position 2

E. Exception at position 1, FileNotFoundException at position 2

F. None of the above.

2 1 Throwable Error Unsupported Operation Exception