Who among the following can not file a complaint before the appropriate consumer forum?

Unregistered consumer association

The correct answer is option 1- Unregistered consumer association.

Unregistered consumer association can not file complaint. Only registered consumer association can file a complaint.

Who can file a complaint: A complaint before the appropriate consumer forum can be made by:
(i) Any consumer;
(ii) Any registered consumers’ association;
(iii) The Central Government or any State Government
(iv) One or more consumers, on behalf of numerous consumers having the same interest; and
(v) A legal heir or representative of a deceased consumer.