As a consumer buying electrical goods, you should look for the ISI mark (Option 4). The ISI mark stands for the Indian Standards Institute, now known as the Bureau of Indian Standards (BIS). It is a certification mark that indicates that the electrical product complies with the Indian safety and quality standards. The ISI mark assures consumers that the product has been tested and meets the necessary safety and performance standards. This mark is essential to ensure that the electrical goods you purchase are safe and of acceptable quality.