单项选择题
A CCNA candidate is working on a 2600 Cisco router. The person needs to verify that the configuration register is set to boot the router IOS from flash memory and use the commands saved in the startup-configuration file.
Which command will display this information, and what is the configuration register value that should be displayed?()
A. show startup-config and 0x2142
B. show version and 0x2102
C. show flash and 0x2102
D. show version and 0x2142
E. show running-config and 0x2142
F. show flash and 0x2142