Countermeasures shall not affect, that is, cannot suspend:

1. the obligation to refrain from the threat or use of force as embodied in the Charter of the United Nations,
2. obligations for the protection of fundamental human rights,
3. obligations of a humanitarian character prohibiting reprisals,
4. other obligations under peremptory norms of general international law (Art. 50).

As a result, all of the statements are correct. The correct option is E.