De or het middenbermbeveiliging?

The correct Dutch article is:

de middenbermbeveiliging

Rule Words ending in -ing: almost always de. See the rule

How to use middenbermbeveiliging

the middenbermbeveiligingde middenbermbeveiliging
this middenbermbeveiligingdeze middenbermbeveiliging
that middenbermbeveiligingdie middenbermbeveiliging
our middenbermbeveiligingonze middenbermbeveiliging
your middenbermbeveiligingjouw middenbermbeveiliging
every middenbermbeveiligingelke middenbermbeveiliging
which middenbermbeveiliging?welke middenbermbeveiliging?
a big middenbermbeveiliging / the big middenbermbeveiligingeen grote middenbermbeveiliging, de grote middenbermbeveiliging