How can the system administrator determine if a system is running in 32-bit or 64-bit mode？（）

A、Use ’prtconf -c’ to see if the system is 64-bit enabled

B、Check the /etc/inittab to see if /etc/method/cfg64 is enabled

C、Use the ls -al to see if /unix is linked to /usr/lib/boot/unix_64

D、Use the lslpp command to see if the bos.mp64 fileset is installed