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A main memory unit with a capacity of 4 megabytes is built using 1M × 1-bit DRAM chips. Each DRAM chip has 1K rows of cells with 1K cells in each row. The time taken for a single refresh operation is 100 nanoseconds. The time required to perform one refresh operation on all the cells in the memory unit is:-A.100 nanosecondsB.100×210 nanosecondsC.100×220 nanosecondsD.3200×220 nanoseconds(A) A(B) B(C) C(D) D

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