Final answer:
The correct answer to the question is that it depends on the restaurant's service protocol, but serving a beverage first is a common practice in many establishments. Hence, the answer may be True.
Step-by-step explanation:
Whether to serve a beverage or a sandwich first would depend upon the policy of the establishment and the preferences of the guest. There is no absolute rule regarding the order of service, and this question seems based in the context of customer service in the hospitality industry. However, in many casual dining situations, it is common practice to serve beverages first, as they can be enjoyed while the customer waits for their food to be prepared. Therefore, if this is the protocol that the restaurant follows, then the answer would be True. It's always important to consider the customer's preference and the service standards of the place of business.