Jones, a consulting manager of Miller & Co., is considering membership on an audit client's board of directors. Jones does not provide any services to this client. Which statement describing this situation is correct under AICPA rules?

a. Jones may join the board because he is not an auditor.

b. Jones may join the board because he is not a partner.

c. Jones may not join the board because the rules prohibit all firm professionals from serving as a director of a client.

d. Jones may not join the board because only non-managerial employees of the firm may serve as client management.