What control best ensures that a service provider's employees adhere to security policies?

To determine which control best ensures that a service provider's employees adhere to security policies, it's essential to consider the effectiveness and enforceability of each option.

The inclusion of an indemnity clause in the contract with the service provider serves as a strong legal mechanism to hold the service provider accountable for the actions of their employees regarding security policy adherence. This clause typically stipulates that the service provider will accept liability for breaches or non-compliance issues that arise due to their employees' actions or negligence. By including this clause in the contract, the enterprise compels the service provider to prioritize compliance and ensure that their employees are trained and aware of the security policies, as the financial and reputational risks are directly tied to their performance.

While signing off on security policies or requiring mandatory security awareness training are valuable steps toward fostering a security-conscious culture, they may not directly enforce adherence among the service provider's employees. Both of these options rely on the goodwill and accountability of the service provider rather than creating a legally binding obligation.

Lastly, modifying security policies to address compliance by third-party users may help tailor security practices to the service provider's specific context, but it does not inherently enforce adherence. The effectiveness of a control lies not only in its design but also in its enforce