What could be the cause of this error?

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. TheTFTP 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.

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