单项选择题

Some xSeries servers support 4-way memory interleaving and some support 2-way interleaving. In both types of interleaving， the data is accessed 256 bits at a time. How is this 256-bit data access achieved with 2-way interleaving？（）

A.The DIMMs used for 2-way interleaving are double the width of DIMM used in 4-way interleaving.
B.The DIMMs used for 2-way interleaving are 64-bit wide and data bits are accessed both on the rising edge and falling edge of the clock cycle.
C.The DIMMs used for 2-way interleaving are 32-bit wide and data bits are accessed both on the rising edge and falling edge of the clock cycle.
D.The DIMMs used for 2-way interleaving are double the width and data bits are accessed both on the rising edge and falling edge of the clock cycle.

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