De or het telebanking?

The correct Dutch article is:

de telebanking

Rule Words ending in -ing: almost always de. See the rule
Meaning (Dutch) het thuisbankieren

How to use telebanking

the telebankingde telebanking
this telebankingdeze telebanking
that telebankingdie telebanking
our telebankingonze telebanking
your telebankingjouw telebanking
every telebankingelke telebanking
which telebanking?welke telebanking?
a big telebanking / the big telebankingeen grote telebanking, de grote telebanking

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).