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The advantage of write (copy) back data cache organization over write through organization is

(a) Main memory consistency

(b) Write allocate on write miss

(c) Less memory bandwidth

(d) Higher capacity requirement
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Answer would be c option as in write back technique when the block to be replaced is dirty block either due to case of read allocate or write allocate then it is written to main memory however in case of write through technique every time whether it is dirty block or nt when ever it is replaced it is written to main memory simultaneously so lesser memory bandwidth in first case here

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