Is it legislated for one to pray the Sunnah of Dhuhr (the supererogatory prayer before the obligatory Dhuhr prayer) with two tashahhuds and one salaam at the end of the fourth rak'ah, and does one recite the Ibraheemiyyah prayer in the first tashahhud? And is it legislated to pray the four rak'ahs with one tashahhud and one salaam?

Voluntary quadruple prayers are permissible either connected, with two Tashahhuds and one Taslim (definition), or with one Tashahhud (definition) at the end. However, it is better to perform them two rak'ahs by two rak'ahs, with a Tashahhud and Taslim after each pair. In the first Tashahhud, according to the majority of scholars, one should only recite the words of the Tashahhud, without the Salat al-Ibrahimiyyah.