De or het waterpoloster?

The correct Dutch article is:

de waterpoloster

How to use waterpoloster

the waterpolosterde waterpoloster
this waterpolosterdeze waterpoloster
that waterpolosterdie waterpoloster
our waterpolosteronze waterpoloster
your waterpolosterjouw waterpoloster
every waterpolosterelke waterpoloster
which waterpoloster?welke waterpoloster?
a big waterpoloster / the big waterpolostereen grote waterpoloster, de grote waterpoloster