Three threading models were covered in class. Please match the correct responses. v Many-to-many A. Good concurrency. If one thread blocks, other threads are not affected and may continue executing. v Many-to-one v One-to-one B. Poor concurrency. If one user thread blocks, the entire process and all its threads blocks. v One-to-many C. This is not one of the models covered in class. D. Good concurrency. One user thread blocking is not much of a problem and we can control the total number of kernel threads