What was the original purpose of the NATO and how did it expand beyond its initial scope? The original purpose of NATO was to protect the global e...

What was the original purpose of the NATO and how did it expand beyond its initial scope?

The original purpose of NATO was to protect the global energy infrastructure, maritime routes, and oil pipelines.
The expansion of NATO began immediately after the fall of the Berlin Wall, in violation of verbal guarantees given to Gorbachev that NATO forces would not move 'one inch to the east'.
The possibility of NATO expanding beyond Germany was not discussed with Gorbachev, even though it was considered in private.
The NATO's mission was altered to include the protection of the 'vital infrastructure' of the global energy system, maritime routes, and oil pipelines.
a) I and II are correct.
b) II, III, and IV are correct.
c) I, III, and IV are correct.
d) All statements are correct.