吊销违法者的经营许可证是( )。

A．行政处分

B．行政处罚

C．执行罚

D．行政强制执行

(A) 条件(1)充分，但条件(2)不充分．
(B) 条件(2)充分，但条件(1)不充分．
(C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
(D) 条件(1)充分，条件(2)也充分．
(E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

There are 105 students taking history and/or mathematics. How many students are taking only mathematics
(1) Thirty students are taking history only.
(2) Fifty students are taking both history and mathematics.