Final answer:
Butler service, typically offered during cocktail parties or the cocktail portion of events, is characterized by servers circulating to offer personal service to guests, making answer A. True.
Step-by-step explanation:
Butler service is indeed typically provided during a cocktail party or during the cocktail portion of a banquet or catered event. The correct answer to the question is A. True. Butler service entails servers circulating among guests, offering them hors d'oeuvres and beverages. This type of service adds a formal touch to the event and ensures guests receive personalized attention while enjoying the cocktails. It is especially popular during high-end events where a touch of elegance and sophistication is expected.