One Key Difference Between the Fed and the European Central

 One key difference between the Fed and the European Central Bank (ECB) in their reserve requirements is that the: 

A)  reserve requirements of the ECB are at a much higher rate than the Fed's.?
B)  ECB's reserve requirements are more difficult for banks to predict.?
C)  reserve requirement of the ECB are determined annually.?
D)  ECB reserve requirement is based on all of a bank's liabilities.