Which of the following is a side effect of extensive usage of swap space?

A: The root filesystem may become full because swap space is always located on the system root partition. B: The overall system performance may degrade because of heavy hard disk use and memory reorganization. C: Since processes always exist completely in either RAM or swap, regular RAM may become unused if the kernel does not move processes back from the swap space to memory. D: The memory may become fragmented and slow down the access to memory pages. However, this can be kept to a minimum by the regular use of memfrag -d. E: Applications need to restart because their virtual memory addresses change to reflect memory relocation to the swap address area.