De or het exportfirma?

The correct Dutch article is:

de exportfirma

How to use exportfirma

the exportfirmade exportfirma
this exportfirmadeze exportfirma
that exportfirmadie exportfirma
our exportfirmaonze exportfirma
your exportfirmajouw exportfirma
every exportfirmaelke exportfirma
which exportfirma?welke exportfirma?
a big exportfirma / the big exportfirmaeen grote exportfirma, de grote exportfirma