What are two requirements to perform a warm Cisco IOS upgrade on a Cisco ISR router? (Choose two.)
A.
at least one enabled Ethernet interface
B.
Cisco IOS version 12.3(2)T or greater
C.
enough memory to decompress the new Cisco IOS image
D.
internal flash memory equaling two times the space required for the current Cisco IOS image
E.
physical access to the router to be upgraded