Final answer:
The subject of this question is Business, and it is discussing the goal of delivering the best possible service or product to customers.
Step-by-step explanation:
The subject of this question is Business. The phrase "Our essential mission and number one priority is to deliver the best possible" indicates that we are discussing a business or organizational mission. In this context, the question is referring to delivering the best possible service or product to customers. This aligns with the goals and objectives of a business.