19) Given a reference string: 4,3,2, 1,4,3,5,4,2,1. How many page faults will occur using LRU? Assuming a 4-page frame.
(A) 5
(B) 6
(C) 7
(D) 8

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統計： A(0), B(0), C(1), D(0), E(0) #2926625