Choose the correct answer

Why does the imperative of Bab Dharaba carry a Kasrah-Hamzah اِضْرِبْ instead of a Dhummah-Hamzah اُنْصُرْ?

Trilateral Bare Regular - Bab 2: Dharaba Yadribu

• Because the middle root letter carries a Kasrah in the present verb
• Because dual commands are passive
• Due to a print variation
• Because dual verbs are always indeclinable