If any of the parties are not satisfied by the order of , they can appeal against such order to the State Commission on the grounds of facts or law within a period of forty-five days from the date of order.

The correct option is District Commission.

Explanation:
Under the Consumer Protection Act, a three-tier quasi-judicial system is established to redress consumer grievances at different administrative levels. This hierarchy consists of:
1. District Consumer Disputes Redressal Commission (District Commission) at the district level.
2. State Consumer Disputes Redressal Commission (State Commission) at the state level.
3. National Consumer Disputes Redressal Commission (National Commission) at the national level.

According to the provisions of the Consumer Protection Act, 2019, if any of the parties are aggrieved by or unsatisfied with an order passed by the District Commission, they have the right to prefer an appeal to the next higher forum, which is the State Commission. This appeal can be filed on the grounds of facts or law and must be preferred within a period of forty-five days from the date of the order.