Under what conditions can an arrest be made for a gross misdemeanor according to NRS 171.136?

An arrest for a gross misdemeanor, according to NRS 171.136, can indeed be made at any time of day or night. This provision allows law enforcement officers the flexibility to take action when they encounter a situation that necessitates an arrest, regardless of the time. The rationale behind this is to ensure public safety and respond promptly to unlawful behavior, which can occur at any hour.

The other choices reflect limitations that do not align with the authority granted by NRS 171.136. For instance, the idea that an officer can only make an arrest when off duty would severely restrict the ability of law enforcement to address crimes effectively. Similarly, restricting arrests to business hours would negate the need for law enforcement to respond to situations occurring outside of regular working hours. Lastly, requiring a search warrant for an arrest is not applicable in this context, as arrests can typically be made based on probable cause without a warrant for specific offenses, including gross misdemeanors.