When upgrading the IOS image, the network administrator receives the exhibited error message. What could be the cause of this error?（）
- A The new IOS image is too large for the router flash memory.
- B The TFTP server is unreachable from the router.
- C The new IOS image is not correct for this router platform.
- D The IOS image on the TFTP server is corrupt.
- E There is not enough disk space on the TFTP server for the IOS image.