在MapReduce编程中,为Job对象设置Mapper类的代码正确的是()。
(A)job.setMapper(new MyMapper())
(B)job.setMapper(MyMapper.class)
(C)job.setMapperClass(new MyMapper())
(D)job.setMapperClass(MyMapper.class)
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(A)job.setMapper(new MyMapper())
(B)job.setMapper(MyMapper.class)
(C)job.setMapperClass(new MyMapper())
(D)job.setMapperClass(MyMapper.class)