Praying the greeting of the mosque, then standing for the third rak'ah in forgetfulness: should he complete it as four?

Question:
This is, O Shaykh, we take 'Abdullah from al-Hawtah. Please, 'Abdullah. Peace be upon you, and Allah's mercy and blessings. And upon you be peace. And peace be upon you, and Allah's mercy. May Allah keep you in good, O Shaykh. May Allah welcome you. You asked, may Allah prolong your life, and I performed the greeting of the mosque at the time of 'Asr before the prayer, and I wanted to pray four rak'ahs, so I prayed two, then I stood up in forgetfulness. Do I complete it as three, sit for the tashahhud, and prostrate for forgetfulness, or do I complete it as four with one tashahhud? May Allah bless you?

Answer:
You have a choice. If you wish, complete it as four with one taslim; because it is permissible in the daytime. And if you wish, sit and limit it to two rak'ahs, then prostrate for forgetfulness. Yes.