Answer:
d. All of these are correct
Explanation:
A non-compete is a clause or agreement in which the parties involved are bound not to compete with one another. Therefore, based on the information provided within the question it can be said that the all of the answers provided are good ways to enforce the non-compete agreement. Since, additional payments, stock grants, and promotions, would incentivize the employees to stay with the company and not compete against it.