With text analytics, information is extracted out of large quantities of various types of textual information. Which of the following is not one of the steps involved in text analytics described in your text?a. Exploration of documents for preliminary categorization or identification of common topicsb. Preprocessing of documents to standardize content as much as possiblec. Categorization and modeling of document content using statistical models and business rulesd. Visualization - translating text data to graphic format (e. g. charts, graphs) for effective reporting

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.