Final answer:
A session that reviews concepts learned one week after a training program is called a Booster session. It's designed to reinforce learning and prevent skill decline.
Step-by-step explanation:
The session that takes place one week after the initial training and includes a review of the concepts learned is typically referred to as a d) Booster session. This term is used in training and educational programs to describe follow-up sessions designed to reinforce and strengthen the knowledge and skills acquired during the main training. Booster sessions are essentially a relapse prevention strategy, ensuring that the learning is solidified, which can help prevent a decline in the proficiency or application of the new skills.