Which is the correct active prohibitive of «يَفْعَلُونَ»?

The Prohibitive: Active and Passive Paradigms with Emphatic Nūn

• لَا يَفْعَلُونَ
• لَا يَفْعَلُوا
• لَنْ يَفْعَلُونَ
• لَا يَفْعَلِينَ