Explanation:

- Regulation of markets: This involves setting rules and policies to ensure fair trade practices within agricultural markets. It helps in protecting farmers from exploitation and ensures better pricing for their produce.

- Provision of infrastructure: Good infrastructure such as roads, storage facilities, and transportation is crucial. It enables efficient movement and storing of agricultural goods, reducing wastage and improving market access.

- Encouragement of cooperative marketing: Supporting farmers to form cooperatives can empower them to collectively market their products. Cooperatives can help farmers gain better negotiation power and share resources.

- All of the above: These measures collectively can significantly improve agricultural marketing efficiency.