GWD16-34?

In an attempt to guarantee the security of its innovative water purification method, the company required each employee to sign a confidentiality agreement prohibiting that its water purification methods be disclosed to companies using an analogous purification process.

1. prohibiting that its water purification methods be disclosed to companies
2. prohibiting them from the disclosing of its water purification methods to any company
3. prohibiting disclosure of its water purification methods to any company
4. that would prohibit them from disclosure of its water purification methods to companies
5. that would prohibit its water purification methods to be disclosed to a company

答案是E，但prohibit的用法我记得就两种呀：prohibit sth; prohibit sth doing sth.

请解释下，谢谢