How is the TCP/IP name resolver forced to use a HOSTS file?

A.
TACL; ADD DEFINE =TCPIP^HOST^FILE, FILE $SYSTEM.ZTCPIP.HOSTS

B.
TACL; ADD DEFINE =TCPIP^HOSTS^FILE, FILE $SYSTEM.ZTCPIP.HOSTS

C.
SCF ; ALTER PROCESS $ZTC0, HOSTFILE SYSTEM.ZTCPIP.HOSTS

D.
SCF ; ALTER PROCESS $ZTC0, HOSTS $SYSTEM.ZTCPIP.HOSTS