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

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.

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Answer: B