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

A.Use the Is -al to see if/unix is linked to /usr/lib/boot/unix_64
B.Check the /etc/inittab to see if there is a load64bit entry
C.Use ’prtconf -c1 to see if the system is 64-bit enabled
D.Use the Islpp command to see if the bos.mp64 fileset is installed