Step 1: Legal background.
The Trade Unions Act, 1926 specifically excludes applicability of provisions of the Co-operative Societies Act, 1912 and the Companies Act, 1956 to registered trade unions.
Step 2: Clarification.
Trade unions are governed independently under the Trade Unions Act, 1926.
Step 3: Conclusion.
Thus, option (c) Both a and b is correct.