The top layer of the $5-$layer network model, the one closest to the user, is sometimes divided up into three layers to yield a $7-$layer model, The bottom four layers remain the same, but the top laver becomes three lavers, for a total of seven.

What are the names of these three top layers in the $7-$layer model?

a$.$ Application

Presentation

c$.$ Session

d$.$ Transportation

e$.$ Internet