Which one is the correct passive form of ‘Open the door’?

1. Let the door be opened.
2. The door must be opened
3. The door should be opened
4. Let the door be opened by you.

Explanation: মূল verb দ্বারা শুরু হওয়া imperative sentence এর passive structure হলো: Let + objective + be + verb এর past participle. যেমন-1) Active: Do the work. Passive: Let the work be done. 2) Active: Open the window. Passive: Let the window be opened.