Conceptually, what is the main difference between concurrency and parallelism? Please use at least $1$ example to support your answer.

Among all of the decomposition techniques that you have learned from the videos, which one would you use? Why?

In the task decomposition, the dependence relationships among the tasks are critical in terms of how to assign tasks to multiple threads or processors to be processed in parallel. Use $1$ example to explain the reason behind this.