1 Use Table 1 and the description below to answer this question and the next question. Table 1 shows the characteristics of 4 students that signed up for a Business Intelligence (BI) course. Gender is student's gender. Previous BI experience indicates whether the student has taken any BI classes before which is a binary variable where 1 represents "yes, student has taken a BI class before", and 0 represents "no, student has not taken any BI classes before". Co-major is student's co-major. Age is student's age in years. Senior indicates whether or not a student is a senior. It is a binary variable where 0 represents "no, student is not a senior" and 1 represents "yes, student is a senior." Table 1. Student characteristics Gender Previous BI Co-Major Age Senior Experience Male 1 Econ 19 Male Finance 20 Female 1 Marketing 21 1 Female Marketing 25 1 How many variables (columns) in Table 1 are categorical? QUESTION 2 Data shown in Table 1 is an example of data. O A. supervised O B. unsupervised O C. structured O D. unstructured QUESTION 3