单选题：Consider a paging system with the page table stored in memory. I

Consider a paging system with the page table stored in memory. If we add TLBs, and 75 percent of all page-table references are found in the TLBs, what is the effective memory reference time ? (Assume that finding a page-table entry in the TLBs takes zero time, if the entry is there.) @[A](1)
A. 250 nanoseconds
B. 350 nanoseconds
C. 400 nanoseconds
D. 200 nanoseconds




A.250 nanoseconds
B.350 nanoseconds
C.400 nanoseconds
D.200 nanoseconds


答案：A