According to Sunnis, what type of government is suggested by Islam?

Nowadays we have all prevalent forms of government in Islamic Ummah Muslim-majority countries: 1. Autocracy /dictatorship (most common... Egypt, Bangladesh, Turkmenistan, Tajikistan, ...) 2. Absolute monarchy (numerous... Saudi Arabia is the most prominent) 3. Democracy (only a handful... Tunisia is one of them) 4. Theocracy (Iran is **probably** the only example) My questions: 1. Does Islam suggest any structure of government? 2. Among above four, What type of government is suggested by Islam? 3. Does Islam explicitly/implicitly support/reject democracy? Note.1: *I am looking for a **Sunni** view in particular .* Note.2: *Kindly, don't give quotations from Quran/Hadith **inline**. First, state a point and give an external link of Quran/Hadith.* . Related: According to Shi'ites, what type of government is suggested by Islam?