Compare the length of terms of office for central bank heads and members of central bank governing boards between the U.S. Federal Reserve and foreign central banks?

a- The Fed has the shortest-term length for the head and the longest-term length for the board members.

b-The lengths of the terms do not vary between the Federal Reserve, the European Central Bank (ECB), the Bank of England, and the Bank of Japan.

c- The Fed has the longest-term length for the head and the shortest-term length for the board members.

d- The lengths of both terms are longer in the US than anywhere else.

.which one would it be?