Which is the correct order when sorting the following contents by the ascending order of formality, i$.$e$.,$ the most formal ranks the first and the least formal ranks the last. $(1).$ Employee management policy, including the medical benefits. $(2).$ The notification email from the CEO to announce the change of the board team. $(3).$ An employee$$s email asking for a sick leave. $(4).$ The minutes for the meeting in the sales department.