下面有关行政许可的说法正确的是_______。

A．行政许可可以依申请作出，也可以依职权作出
B．行政许可是行政机关对已有法律关系的认可
C．行政许可是准予相对人从事特定活动的行政行为
D．行政许可一般为非要式行政行为

---Can you ask him to give up the foolish idea?

---_____ no point in doing so—he’ll never change his mind.

A．It is

B．It has

C．There is

D．There has