Match the description to the correct multithreading model

This multithreading model maps each user thread to a kernel thread

This multithreading model multiplexes many user$-$level threads to a

smaller or equal number of kernel threads

This multithreading model maps many user$-$level threads to one

kernel thread

This multithreading model allows a user$-$level thread to be bound to

one kernel thread, in addition to a many to many mapping