What should be checked on the router, and which command should be used to gather this information?

Before installing a new, upgraded version of the IOS, what should be checked on the router, and which command should be used to gather this information? (Choose two.)
A. the amount of available ROM
B. the amount of available flash and RAM memory
C. the version of the bootstrap software presents on the router
D. show version
E. show processes
F. show running-config

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