Assertion: In a case decided by the District Consumer Forum, the appeal can be filed before the State Commission and, thereafter, the order of the State Commission can be challenged before the National Commission and finally to Supreme Court.

Reasoning: If any of the parties are not satisfied by the order of National Commission can appeal against such order to the Supreme Court of India within a period of thirty days of such order.

Assertion (A) is true but Reasoning (R) is not correct.

The correct answer is Option 3: Assertion (A) is true but Reasoning (R) is not correct.

Assertion: In a case decided by the District Consumer Forum, the appeal can be filed before the State Commission and, thereafter, the order of the State Commission can be challenged before the National Commission and finally to Supreme Court. This is correct. 

Reasoning: If any of the parties are not satisfied by the order of National Commission can appeal against such order to the Supreme Court of India within a period of forty five days of such order. This is false. If any of the parties are not satisfied by the order of National Commission can appeal against such order to the Supreme Court of India within a period of thirty days of such order.