De or het raadbrief?

The correct Dutch article is:

de raadbrief

This word is not in the word lists we use to double-check answers.

How to use raadbrief

the raadbriefde raadbrief
this raadbriefdeze raadbrief
that raadbriefdie raadbrief
our raadbriefonze raadbrief
your raadbriefjouw raadbrief
every raadbriefelke raadbrief
which raadbrief?welke raadbrief?
a big raadbrief / the big raadbriefeen grote raadbrief, de grote raadbrief