For a proper cool down session, the most effective choice would be:
a. 5 to 10 minutes jogging/walking or 5 to 10 minutes of static stretching exercises
This option allows your body to gradually transition from a high-intensity workout to a resting state, helping to reduce muscle soreness and aid recovery. Static stretching can also improve flexibility and help relax the muscles.
While other activities like light activity or floor work can be beneficial after a workout, they may not serve as an optimal cooldown in all situations.