Define 'lead supplier'.

The definition of a 'lead supplier' refers to a primary supplier who is deemed critical to the success of the supply chain due to their importance and reliability. These suppliers play a pivotal role in ensuring that materials, components, or services are delivered consistently and meet the quality standards necessary for the overall performance of the supply chain.

A lead supplier often has a strong relationship with the buying company, which results in a partnership that enhances collaboration and innovation. Their reliability can also help mitigate risks in the supply chain, as they are often involved in strategic planning and alignment of supply chain goals.

The other choices, while related to different types of suppliers, do not capture the essence of what makes a supplier a 'lead supplier.' For example, focusing solely on the lowest price, higher risk, or exclusive contracts misses the broader perspective of how these suppliers contribute to overall supply chain success and stability.