De or het postgirodienst?

The correct Dutch article is:

de postgirodienst

How to use postgirodienst

the postgirodienstde postgirodienst
this postgirodienstdeze postgirodienst
that postgirodienstdie postgirodienst
our postgirodienstonze postgirodienst
your postgirodienstjouw postgirodienst
every postgirodienstelke postgirodienst
which postgirodienst?welke postgirodienst?
a big postgirodienst / the big postgirodiensteen grote postgirodienst, de grote postgirodienst