Which statement about Memory Management Unit $("$MMU$")$ is invalid?

MMU is a hardware piece located in CPU or on a separate chip next to CPU

MMU tracks the memory usage of a running process, and release the space for reuse once the process stops running.

MMU handles the mapping from the virtual address generated by CPU for a running process to the physical address at which code and data of the process are located in the main memory.

MMU conduct the protection check when mapping a running process's virtual address to physical address to ensure the process references its allocated space only.