Interpret the figure to explain how histidine and aspartate make serine a better nucleophile.  a.) histidine pulls a proton away from serine  aspartate pulls a proton away from histidine  b.) histidine pulls a proton away from serine aspartate donates a proton to histidine  c.)histidine donates a proton to serine aspartate pulls a proton away from serine d.) histidine donates a proton to serine  aspartate donates a proton to histidine

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