How can a court compel a defendant to appear for arraignment if they have not yet come under its jurisdiction?

The correct answer is the issuance and execution of a warrant of arrest. This procedure is a critical mechanism within the judicial system that allows a court to compel an individual's appearance when they have not voluntarily come under its jurisdiction. If a defendant fails to appear, a warrant serves as an official order allowing law enforcement to arrest the individual and bring them to court.

In the context of arraignment specifically, a warrant ensures that the court can enforce its authority and uphold the legal process. When a warrant is issued, it provides law enforcement with the legal grounds to detain the defendant, thus enabling the court to assert control over the situation and ensure that the defendant is brought before it.

Other methods such as issuing a fine or sending a letter lack the legal binding force necessary to compel attendance, as they do not impose immediate consequences for non-compliance. Similarly, a mobile summons, although potentially helpful in notifying a defendant, would not carry the same enforceable weight as a warrant. Therefore, the issuance and execution of a warrant is the appropriate and legally recognized approach to ensure a defendant appears for their arraignment.