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5. [15 pts] Snooping-based cache protocol Consider a snooping-based shared memory system performing the following memory related operations. Please indicate the value of the memory location X, and the corresponding values in 3 caches after the execution of each operation when using snooping protocols. Initially, we have data X=5 in the main memory. Pe 그 Cache- Cache Cache Main Memory X = 5 X in cache Q X in cache S Request read miss X in Main memory 5 X in cache P 5 valid P reads X Q reads X P updates X to 10 S reads X S updates X to 15 S reads X Q updates X to 20 Q reads X