In the protocol layer service model, each layer provides its service by:

Group of answer choices

$(1)$ performing the actions in the layer above it and by $(2)$ using the services of that layer above to also perform the actions of its own layer.

$(1)$ performing certain actions within that layer and by $(2)$ using the services of the layer directly above it$.$

$(1)$ performing certain actions in the layer below it and by $(2)$ using the services of the layer directly above it$.$

$(1)$ performing certain actions within that layer and by $(2)$ using the services of the layer directly below it$.$