Which of the following is a key producer located in Sonoma County?

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Keller Estate is recognized as a significant producer located in Sonoma County, known for its high-quality wines, particularly its Pinot Noir and Chardonnay. The estate sits on a picturesque hillside that offers ideal terroir for the cultivation of these varietals, which thrive in the region's unique microclimates and diverse soils. Keller Estate has established a reputation for its meticulous vineyard practices and a commitment to producing wines that reflect the character of Sonoma County.

In contrast, Chateau Montelena is primarily associated with Napa Valley, best known for its pivotal role in the 1976 Judgment of Paris wine competition. Silver Oak, while also producing highly regarded Cabernet Sauvignon, is mostly linked to Napa Valley as well, though they do have a vineyard in Alexander Valley (Sonoma). The California Wine Company does not represent a specific, prominent producer recognized for its contributions to the Sonoma County wine scene.