Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides ?

In a period, the nature of oxides varies from basic to acidic while in a group, basic nature of oxides increases.Group                  1            2             13 Period 3 →       Na2O     MgO      Al2O3                                           (Amphoteric oxide) Period 4 →        K2O      (Strongly basic)Hence, basic nature of oxides are as followsAl2O3  <  MgO < Na2O  <  K2O