The total shares of a listed company is 1.5 million, the company promised not to increase their investment within three years in its split share structure reform, and then the company's article of association have been modified. Which of the following revised contents is illegal?
选项：

A:
A:Shares being held by the directors of the Company cannot be transferred within three years after resignation.;
B:
B:The company repurchases back 10 million of its shares within one year as stock options.;
C:
C:Shares being held by Supervisor of the Company can be sold after being approved by the general shareholders meeting at the time of resignation.;
D:
D:In any time, a company must not accept its own shares as collateral.