单选题：Delete key 260 from the B tree T of order 5 shown in the followi

Delete key 260 from the B tree T of order 5 shown in the following figure. After some adjustments we obtain another B tree T1. Which one of the following is an *impossible* sequence of keys at the root of T1?






A.60, 90, 280
B.60, 90, 350
C.60, 85, 110, 350
D.60, 90, 110, 350


答案：D