While applying the ecological systems model, the is a special subset of an action system that includes the practitioners and formal service systems involved in work on the target problems.
a) closed systemb) client systemc) open systemd) agency system

option D

Explanation:

The correct answer is option D

Agency system service is the special subset of action system which includes practitioners and formal service system to work together on the target problem.

closed system is one  which does not interact  any matter in the surrounding.

client system is the system in which clients are related to one another.

open system is the system when the exchange of information, energy, material takes place.

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