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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 Qe Se LLLLLLLLL Cachee Cache Cachee Main Memory X = 54 X in Main memory 5 Request read miss X in cache P 5 valid X m cache Q X m cache S P reads X Q reads X Pupdates X to 10 S reads X S updates X to 15 S reads X Q updates X to 20 Q reads X