Select the correct definition of a least squares regression line. A line fitted to data points that minimizes the sum of the squared residuals. A line fitted to data points such that the line goes through the greatest number of points. A line fitted to data points such that the sum of the squared horizontal differences between the line and the data points is minimized. A line fitted to data points that minimizes the absolute value of the vertical deviations between the line and data points. A line fitted to data points where the correlation between the variables is at least 0.5.