Which of the following can file a complaint in the consumer courts?

The correct answer is option 4- Any of the above.

Any of the above can file a complaint in the consumer courts.

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.