To solve this question, the user needs to know the benefits of setting clear security roles.

Option A: Establishes personal accountability. This option is a benefit of setting clear security roles. When roles are clearly defined, it is easier to identify who is responsible for specific tasks, which leads to personal accountability.

Option B: Enables continuous improvement. This option is also a benefit of setting clear security roles. When roles are clearly defined, it is easier to identify areas that need improvement and implement measures to address them, which leads to continuous improvement.

Option C: Reduces cross-training requirements. This option is not a benefit of setting clear security roles. In fact, having clear security roles may lead to an increase in cross-training requirements, as it allows for better coordination and collaboration between team members with different roles.

Option D: Reduces departmental turf battles. This option is a benefit of setting clear security roles. When roles are clearly defined, it reduces the likelihood of conflicts arising from overlapping responsibilities and reduces departmental turf battles.

Therefore, the correct answer is:

The Answer is: C. Reduces cross-training requirements.