您如何看待本site中提到的问题4的答案？会是吗？答案是对是错问题:4InthestandardwordcountMapReducealgorithm,whymightusingacombinerreducetheoverallJobrunningtime?A.Becausecombinersperformlocalaggregationofwordcounts,therebyallowingthemapperstoprocessinputdatafaster.B.Becausecombinersperformlocalaggregationofwordcounts,therebyre