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 main memory unit with a capacity of 4 megabytes is built using 1M ×

1.	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 nanoseconds
B.	100×210 nanoseconds
C.	100×220 nanoseconds
D.	3200×220 nanoseconds
Answer» C. 100×220 nanoseconds

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