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[单选题]
已知a=set(‘abc’),b=set(‘cdef’),则a-b的结果为()。
A.set([‘c’])
B.set([‘a’,‘b’])
C.set([‘c’,‘d’,‘e’,‘f’])
D.set([‘a’,‘b’,‘c’,‘d’,‘e’,‘f’])
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A.set([‘c’])
B.set([‘a’,‘b’])
C.set([‘c’,‘d’,‘e’,‘f’])
D.set([‘a’,‘b’,‘c’,‘d’,‘e’,‘f’])
A.default character set utf8
B.use utf8
C.default collate utf8_general_ci
D.show character set utf8