Select ALL CORRECT statements on parallel programming

OpenMP is an implementation of multiprocessing, not multithreading

Matrix$-$vector multiplication can be calculated by parallel strategies, including row decomposition and column decomposition

The key difference between the shared memory and distributed memory parallel programming models is whether multiple threads can see others' memory address space

According to Foster's methodology, there are four steps for designing parallel programs: partitioning $-->$ communication $-->$ aggregation $-->$ mapping "critical" is one of the most used synchronization methods, which creates a piece of sequential code region