Which of the following is FALSE?

1. A.

   DMA is a mechanism for allowing an I/O device to transfer data to and from memory without involving the CPU in the transfer.

2. B.

   An advantage of implementing threads in user space is that they don't incur the overhead of having the OS schedule their execution.

3. C.

   A TLB miss could occur even though the requested page was in memory.

4. D.

   A context switch from one process to another can be accomplished without executing OS code in kernel mode.

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