把路由器当前配置文件存储到NVRAM中的命令是（ ） 。
ARouter（confg）#copy current to starting
BRouter#copy start to running
CRouter（config）#copy running-config starting-config
DRouter#copy run startup
ARouter（confg）#copy current to starting
BRouter#copy start to running
CRouter（config）#copy running-config starting-config
DRouter#copy run startup