'Who is doing the work? 'বাক্যটির Passive form হচ্ছে----

অপশনসমূহ
সঠিক উত্তর চিহ্নিত
ক By whom is the work being done?
খ By whom is the work done?
গ By whom was the work being done?
ঘ By whom is the work has done?