【单选题】【消耗次数：1】
“一个事务对数据库的所有操作，是一个不可分割的工作单元，这些操作要么全部执行要么什么也不做”，这是事务的（ ）
①
原子性
②
一致性
③
隔离性
④
持久性
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【简答题】
事务中包括的诸操作要么都做，要么都不做指的是事务ACID特征中的[填空1]性。
【单选题】
事务是持久性是指___。
①
A.事务一旦提交，对数据库的改变是永久的
②
B.事务中包括的所有的操作要么都做，要么都不做
③
C.一个事务内部的操作及使用的数据对并发的其他事务是隔离的
④
D.事务必须是使数据库从一个一致性状态变到另一个一致性状态
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