Method of Performing 4 Rak‘āt After Zuhr

For the hadith about one who preserves doing 4 rakat before zhuhr and 4 after, Allah will make the fire haram on him, is the 2 sunnah after fard included, so one can pray 2 sunnah and add 2 nafl after (which adds to 4), or do they pray 4 rakat after the 2 sunnah of zhuhr?