De or het transponderverplichting?

The correct Dutch article is:

de transponderverplichting

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

How to use transponderverplichting

the transponderverplichtingde transponderverplichting
this transponderverplichtingdeze transponderverplichting
that transponderverplichtingdie transponderverplichting
our transponderverplichtingonze transponderverplichting
your transponderverplichtingjouw transponderverplichting
every transponderverplichtingelke transponderverplichting
which transponderverplichting?welke transponderverplichting?
a big transponderverplichting / the big transponderverplichtingeen grote transponderverplichting, de grote transponderverplichting