In which two regions did the eisenhower administration effectively use brinkmanship?
a korea and indochina
b vietnam and cuba
c russia and poland
d france and germany

Although the effectiveness of these tactics can be question, it was in "a Korea and Indochina" that the Eisenhower administration effectively use brinkmanship, since this was part of the Cold War. 

The answer b is correct this all occurred during the red scare