Upon whom is performing Sujud al-Tilawah legally Wajib when a prostration verse is recited?

Prostration of Recitation (سجود التلاوة) and Gratitude

• Only upon the one who recites the verse.
• Only upon the one who listens to it with intention.
• Upon both the reciter (Tali) and the listener (Sami'), whether the hearing was intentional or unintentional.
• Only upon the Imam of the mosque.