Which command will always find the IBM QCMD program?

Which command will always find the IBM QCMD program?

A.
WRKOBJ OBJ (*LIBL/QCMD) OBJTYPE(*PGM)

B.
WRKOBJ OBJ (*CURLIB/QCMD) OBJTYPE(*PGM)

C.
WRKOBJ OBJCALLUSR/QCMD) OBJTYPE(*PGM)

D.
WRKOBJ OBJ(*USRLIBL/QCMD) OBJTYPE(*PGM)

Explanation: