What is the correct plural form of le cahier?

Le cahier : masculin/singulier
Les cahiers : masculin/pluriel

Hi! 
masculine singular form = le cahier

masculine plural form      = les cahiers

those are determined : determinants definite  the '= masculine, feminine and plural= le, la les

for undefined  like a/an are in French = un , une, des , it will be a/an
 except you don"t have any plural for underfined

le cahier =the exercise book/ des cahiers = the exercises books

un cahier = an exercise book / des cahiers = exercise books

hope I helped

Can you give a list then i can choose the best answer

Dog
in french = chien