You are the manager of a research group that is developing a new chemical material. You hire a person from a competing company who has a great deal of expertise in this area. The person contributes greatly to the progress of your project. During conversations with the person you determine that many of this person's ideas were developed by the competing company. What do you do$?$

Investigate the employee for security reasons.

Accept the new ideas.

Tell the person that he or she should not mention that the ideas came from another company.

Sign a nondisclosure agreement or an intellectual property agreement with this person before he or she leaves your company.