What is the main difficulty when you are designing a dashboard? Select one: O a. Allowing all users to access it across the company. O b. Having fast internet connection and latest hardware to support it. O c. Accessing the latest web browsers. O d. Fitting all the required information on a single screen. Unlike Operational databases, data warehouses are Select one: O a. subject-oriented and nonvolatile. b. product-oriented and nonvolatile. O c.product-oriented and volatile. d. subject-oriented and volatile. "Pivot" is NOT one of the OLAP operations. Select one: True False