किस प्रकार के परमाणु रिएक्टर (Nuclear reactor) में साधारण पानी (हल्के पानी) का उपयोग मंदक (retardant) और शीतलक (coolant) दोनों के रूप में एक साथ किया जाता है?

In a typical Pressurized Water Reactor (PWR), the moderator and coolant used are respectively:

Consider the following statements regarding Molten Salt Reactors (MSRs): I. In these reactors, molten salts may serve as the coolant and, in some designs, also act as the carrier for dissolved nuclear fuel. II. Such reactors typically operate at higher temperatures and lower pressures, which can improve the thermodynamic efficiency of electricity generation. III. India has recently commissioned a thorium-based Molten Salt Reactor for commercial power generation. Which of the statements given above is/are correct?