【单选题】
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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