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The classification of vintage dated sherry is best represented by the term known as "VOS," which stands for "Vinum Optimum Signatum." VOS sherries are specifically bottled from casks that have been aged for a minimum of 20 years and carry a vintage date, denoting their age and time of maturation.

While "Anada" refers to a sherry that is made from a single year's harvest and can be dated, it does not necessarily denote the same classification as VOS. The focus on VOS is its strength in both aging and vintage specification, emphasizing quality and tradition in production.

Oloroso and Palo Cortado, while also important types of sherry, do not inherently imply vintage dating. Oloroso is a robust, dry sherry, whereas Palo Cortado is a unique style that possesses characteristics of both Oloroso and Amontillado, without the necessity of vintage designation. Therefore, the correct answer related to vintage dated sherry is VOS.