As part of John's latest project, he asked his team to release partially completed work to customers in order to obtain early feedback. This then allowed the team to use feedback to modify the work. What is the type of project life cycle being used by John?

John's team is using an iterative project life cycle. Iterative project lifecycles are a type of Agile project lifecycle that emphasizes breaking down the project into smaller, more manageable phases or iterations. Each iteration is focused on completing a specific set of tasks and delivering a working product or service. At the end of each iteration, the team receives feedback from customers and stakeholders, which is then used to refine the product or service in the next iteration.
In John's case, his team is releasing partially completed work to customers in order to obtain early feedback. This is a common practice in iterative projects, as it allows the team to identify and address potential issues early on. This iterative feedback loop helps to ensure that the product or service meets the needs of the users and that the project is delivered on time and within budget.