【单选题】【消耗次数：1】
下列关于字符之间大小关系的排列，正确的是()。
①
空格符D
②
空格符d
③
d空格符
④
D空格符
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空格及制表符会被替换为空格，开头和结尾的空格被移除，而多个连续的空格会被缩减为单一的空格，下面正确的选项是（）。
①
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④
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