Explanation:
The chief operating officer (COO) is highly-placed within an organization and has the most knowledge of business operations and objectives. The chief internal auditor and chief legal counsel are appropriate members of such a steering group. However, sponsoring the creation of the steering committee should be initiated by someone versed in the strategy and direction of the business. Since a security manager is looking to this group for direction, they are not in the best position to oversee formation of this group.