If the additional Surah was forgotten in the first two rak'ahs of Isha, which recovery rule does the source give?

The Wajib Acts of Prayer, Part 1: Recitation Rules

• Read the missed Surah in the later rak'ahs with al-Fatihah and perform Sujud al-Sahw.
• Cancel the prayer immediately.
• Repeat Wudu and restart.
• Leave all recitation in the later rak'ahs.