De or het secondegrens?

The correct Dutch article is:

de secondegrens

How to use secondegrens

the secondegrensde secondegrens
this secondegrensdeze secondegrens
that secondegrensdie secondegrens
our secondegrensonze secondegrens
your secondegrensjouw secondegrens
every secondegrenselke secondegrens
which secondegrens?welke secondegrens?
a big secondegrens / the big secondegrenseen grote secondegrens, de grote secondegrens