Residuals and what least squares minimises

For these 10 cases, least squares minimises the sum of the signed vertical residuals from the fitted line

For these 10 cases, least squares minimises the number of non-zero vertical residuals from the fitted line

For these 10 cases, least squares minimises the mismatch between the fitted line's slope and the data's rise

For these 10 cases, least squares minimises the sum of the squared vertical residuals from the fitted line