问题描述：
[单选]
When designing an InnoDB table， identify an advantage of using the BIT datatype Instead of one of the integer datatypes．（）在设计InnoDB表时，确定使用BIT数据类型而不是integer数据类型的优点。
A．BIT columns are written by InnoDB at the head of the row, meaning they are always the first to be retrieved.
B．Multiple BIT columns pack tightly into a row, using less space.
C．BIT (8) takes less space than eight TINYINT fields. 位(8)占用的空间小于8个TINYINT字段。
D．The BIT columns can be manipulated with the bitwise operators &, |, ~, ^, <<, and >>. The
E．other integertypes cannot.
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