Differences between user and kernel level threads, Programming Languages

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Question :

(a) Many systems provide support for both user threads and kernel threads, resulting in different multithreading models.

What are the two differences between user-level threads and kernel-level threads?

(b) Under what circumstances is one type better than the other?

(d) Describe the following multithreading model:

I. Many-to-one
II. One-to-one
III. Many-to-Many.

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