Which two commands can be used to effectively starve a system of its resources? (Choose two.)

A.
/usr/sbin/crash

B.
cp /dev/zero /var/tmp/testfile

C.
cp /dev/null /var/tmp/testfile

D.
telnet localhost chargen | telnet localhost discard

E.
i=0; while :; do touch /tmp/$i; i=`expr $i + 1`; done