An administrator tries to change the checksum_offload setting on ent0, but the chdev command responds that the adapter is busy. What can be done to resolve this?（）

• A、Use chdev with -P flag and run cfgmgr.
• B、Use chdev with -R flag and run cfgmgr.
• C、Use chdev with -P flag and reboot the system.
• D、Use chdev with -R flag and reboot the system.