71.
The answer is: D
Explanation
The correct option is D: All of these.
According to Section 260 of the CrPC, any Chief Judicial Magistrate, any Metropolitan Magistrate, or any Magistrate of the first class who has been specially empowered by the High Court may try cases summarily, if they think fit. This means that the power of summary trial is not exclusive to any one category of magistrates, but can be exercised by any of them, subject to the conditions and limitations prescribed by the law