![](https://lstatic.shangxueba.com/sxbzda/h5/images/m_q_title.png)
After making changes to the router, you issue the "copy running-config startup-config
A. The NVRAM is corrupted.
B. The boot system commands were omitted in the configuration.
C. The configuration register setting is incorrect.
D. The upgraded configuration incompatible with the hardware platform.
E. The upgraded IOS incompatible with the hardware.
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)