Q43

MSQ2 marks

Consider two set-associative cache memory architectures: $\text{WBC}$ , which uses the write back policy, and $\text{WTC}$ , which uses the write through policy. Both of them use the $\text{LRU}$ (Least Recently Used) block replacement policy. The cache memory is connected to the main memory. Which of the following statements is/are TRUE?

(A)

A read miss in $\text{WBC}$ never evicts a dirty block

(B)

A read miss in $\text{WTC}$ never triggers a write back operation of a cache block to main memory

(C)

A write hit in $\text{WBC}$ can modify the value of the dirty bit of a cache block

(D)

A write miss in $\text{WTC}$ always writes the victim cache block to main memory before loading the missed block to the cache

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