Which of the following statements is INCORRECT regarding the Greek Debt Crisis:

a	Short of highly synchronized economies, currency unions require mechanisms to even out member countries' difference in growth to succeed, such as a fiscal union.
b	Member countries in a currency union can have different economic development, which can cause problems as they cannot respond to their domestic issues with independent monetary policy.
c	It is an example of the Trilemma which means any monetary authority would have to give up one of the three monetary goals.
d	Currency unions cost countries monetary independence without providing any benefit.