Explanation:

Both statements are incorrect.

Anti-dumping duty (ADD) 

• It is a customs duty on imports providing a protection against the dumping of goods sold at prices substantially lower than the normal value. 
• In most cases, this is the price foreign producers charge for comparable sales in the producer’s own country. 

Countervailing duty 

• Anti-dumping duty is different from countervailing duty. The latter is imposed in order to counter the negative impact of import subsidies to protect domestic producers.
• It is a customs duty on goods that have received government subsidies in the originating or exporting country. 
• It is possible to have both ADD and countervailing duty on a product.

Hence option 4th is correct.