<Tr> <Th> Federal Reserve Bank </Th> <Th> Letter </Th> <Th> Number </Th> <Th> Branches </Th> <Th> Website </Th> <Th> President </Th> </Tr> <Tr> <Td> Boston </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> http://www.bos.frb.org/ </Td> <Td> Eric S. Rosengren </Td> </Tr> <Tr> <Td> New York City </Td> <Td> </Td> <Td> </Td> <Td> Buffalo, New York (closed as of October 31, 2008) </Td> <Td> http://www.newyorkfed.org/ </Td> <Td> William C. Dudley </Td> </Tr> <Tr> <Td> Philadelphia </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> http://www.philadelphiafed.org/ </Td> <Td> Patrick T. Harker </Td> </Tr>

Which of the following is not a part or component of the federal reserve​ system