The correct option is A ISI mark
The government of India has created some standards for almost every product to protect the economic interests of all citizens. These standards are like AGMARK for agricultural products, ISI mark for electric products, BIS mark for gold ornaments and FPO mark for all the processed fruit products. It is advised to use electrical appliances and gadgets, which are electricity efficient. ISI mark is an assurance of conformity to the specifications given on the products. It is therefore suggested to use ISI mark products.