The German system of codetermination includes two major features, works council and:

A) Sector bargaining.
B) Enterprise unions.
C) Solidaristic work policies.
D) Employee representation on supervisory boards.

The German system of codetermination includes works councils, which represent employees at the company level and have a voice in management decisions. Another major feature of the system is employee representation on supervisory boards, which allows employees to have a say in the overall strategy and direction of the company. This is unique to Germany and is not found in many other countries. Sector bargaining and enterprise unions are not necessarily part of the German system of codetermination, although they may be used in some cases. Solidaristic work policies refer to a broader set of principles and practices that promote cooperation between workers and employers, but they are not a specific feature of the German codetermination system.