Which of the following actions will enable 64-bit applications on a system with  32-bit kernel（）

• A、Use "smit load64bit" to enable the 64-bit applications.
• B、Re-install all applications with 64-bit versions.
• C、Re-install the OS with 64-bit kernel enabled.
• D、Change the kernel to 64bit， reboot， and then use the following command： chdev -l sys0 -a "applications=64_bit"