Which of the following pairs of independent variables would violate (or most likely violate) classical assumption VI (No perfect multicollinearity between independent variables)? Select all that...

Extracted text: Which of the following pairs of independent variables would violate (or most likely violate) classical assumption VI (No perfect multicollinearity between independent variables)? Select all that apply. O a. X; and X,2 O b. X and 2X O c. Consumption and disposable income (in the United States over the last 30 years) O d. Right shoe and left shoe size (of students in your class)