A.Create one global group named G_Executives. Make all executives user accounts members of that group.
B.Create two global groups named G_Executives and one universal group named U_Executives. Make the two global members of U_Executives. Make the executive user accounts members of the appropriate global group.
C.Create three global groups named G_NY_Executives and G_Chi_Executives and G_Executives. Make G_NY_Executives and G_Chi_Executives members of G_Executives. Make the executive user accounts members of the appropriate global group.  
D.Create one domain local group named DL_Executives. Make all executive user accounts members of that group.