You have the data from 250 people who completed a 6-item job-satisfaction scale. The response options for the items on this scale ranged from 1-Strongly Disagree to 7-Strongly Agree. Consider the summary statistics for the first three items. Item 1: Mean = 3.386, SD = 0.510 Item 2: Mean = 2.662, SD = 0.940 Item 3: Mean = 4.934, SD = 0.700 Covariance between Item 1 and Item 2, COV = 0.307. Covariance between Item 1 and Item 3, COV = 0.175. Covariance between Item 2 and Item 3, COV = 0.178. Imagine that you added the values in these three columns together to form a new column. What is the variance of that column? (a) 1.885 (b) 2.283 (c) 2.179 (d) 2.954