Which of the following statements is not correct?

a. At the operational level, day-to-day business decisions are made, typically in real-time or with a short time frame.

b. At the tactical level, decisions are made by middle management with a medium-term (e.g., a month, a quarter, a year) focus.

c. At the strategic level, decisions are made by senior management with long-term implications (e.g., 1, 2, 5 years, or more)

d. A data warehouse provides a centralized, consolidated data platform by integrating data from different sources and in different formats. As such, it provides a separate and dedicated environment for operational decision-making.