Final answer:
Option 3, 'a flavored style often with notes of citrus zest and mulling spice,' is not a major traditional style of whiskey, as traditional styles do not include post-distillation flavorings.
Step-by-step explanation:
The question asks which option is NOT a major style of whiskey. To answer, it is important to understand that the major traditional styles of whiskey focus on the grain used, the distillation process, and the aging environment, but not specifically flavors added post-distillation, such as citrus zest and mulling spice. Therefore, the correct answer is:
3) a flavored style often with notes of citrus zest and mulling spice
This is not considered a traditional style of whiskey, as traditional styles do not typically include post-distillation flavorings. The three remaining options are indicative of the various traditional styles of whiskey, highlighting differences in taste and texture due to the distilling and aging processes.