A critical piece of equipment broke during a project execution phase.

Renting equipment until the critical piece is repaired is a "Mitigate" response. Mitigation involves taking actions to reduce the impact or likelihood of a risk event. In this case, renting equipment is a way to reduce the impact of the equipment breakdown on the project’s timeline and execution, thereby ensuring that the project can continue with minimal disruption.

PMI’s guidelines describe mitigation as a strategy to reduce the severity or probability of a risk, making it a suitable response in this scenario​​.