What is the difference between write back and write through?
A. With write back, main memory is updated immediately, but with write through, the memory is updated only when the block is replaced.
B. With write through, main memory is updated immediately, but with write back, the memory is updated only when the block is replaced.
C. With write through, the block is replaced when it is written, but with write back, it is replaced when it is read.
D. With write through, the block is replaced when it is read, but with write back, it is replaced when it is written.
E. They are two names for the same thing.
