
The underflow of a B-tree happens whenB树的下溢发生于:
A.
the height of the tree decreases B树高度减少
B.
the property of the B-tree is violated due to inserting a key 插入关键码后违反了B树的性质
C.
the property of the B-tree is violated due to deleting a key 删除关键码后违反了B树的性质
D.
inserting a key to a leaf node 在叶节点插入关键码