What are the advantages of DDR$3$ over DDR$2,$ assuming the same operating frequency? $($Select two.$)$

$$ DDR$3$ includes a buffer between the data bus and the memory.

DDR$3$ uses less power than DDR$2.$

DDR$3$ operates at $1\mathrm{.}8$ volts.

DDR$3$ doubles the data transfer rate of DDR$2.$

DDR$3$ accepts four consecutive $64-$bit words per bus clock cycle.