Final answer:
The fourth step in the planning process typically revolves around implementing a plan by deploying resources and executing strategies to realize defined objectives. Option a.
Step-by-step explanation:
The fourth step in the planning process is often associated with implementing a plan option a. Once you have defined the objectives, developed premises about future conditions, and made a plan that aligns with those objectives, the next critical phase is to bring that plan into action. This involves deploying resources, executing the strategies, and monitoring the progress to ensure that the plan is moving toward achieving the defined objectives in an achievable and appropriate manner.