Interesting question.
My stab at it would be -
a. If you are an automous radar unit with the authority to work inside that airspace then it has to be a Radar Control Service as the a/c is inside controlled airspace. But then how do you apply the maxim that says inside and outside CAS are considered as separated ? Presumably you have to tell the pilot that standard separation may not be applied.
b. If you are not an automous radar unit you don't give a radar service as you do not have the authority.
