Refer to the exhibit.
Why is flash memory erased prior to upgrading the IOS image from the TFTP server?
A . The router cannot verify that the Cisco IOS image currently in flash is valid.
B . Flash memory on Cisco routers can contain only a single IOS image.
C . Erasing current flash content is requested during the copy dialog.
D . In order for the router to use the new image as the default, it must be the only IOS image in flash.
Answer: C