Forgetting to say 'Subhan Rabbiy al-A`la' in Sujud and having doubts regarding one's Salah

Q: I had some doubts about the Salah (Prayer) I offered, but I forgot to perform Sujud-ul-Sahw (Prostration of Forgetfulness) and also forgot to say, "Subhana Rabbiyal-A‘la (I extol the Perfection of my Lord, the Most High)" while prostrating. Is my Salah nullified?

A: If the person offering Salah, as an Imam (the one who leads congregational Prayer) or individually, forgets any of the obligatory actions of Salah, such as saying, "Subhana Rabbiyal-A‘la," then they should perform Sujud-ul-Sahw before saying Taslim (salutation of peace ending the Prayer). In case of being a Ma’mum (a person being led by an Imam in Prayer) who joins the congregational Salah from its commencement, then the Imam bears the responsibility, and there is nothing wrong if they perform Sujud-ul-Sahw after Taslim.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.