Which Guardian processes are required to be up and running when starting the OSS root fileset?

A.
OSS name server $ZPNS and the OSS file manager $ZFM

B.
OSS transport agent $ZTA and OSS local socket server $ZPLS

C.
OSS pipe server $ZPS and OSS message queue server $ZMSGQ

D.
OSS monitor $ZPMON and the Safeguard monitor $ZSMP