Under which condition would a lawyer be exempt from registering under REBBA?

A lawyer would be exempt from registering under REBBA (Real Estate and Business Brokers Act) because lawyers are regulated by the Law Society of Ontario and do not need to be registered under REBBA to provide real estate services as part of their legal practice. This exemption is outlined in REBBA itself, which recognizes lawyers as professionals who are already subject to comprehensive professional regulation and oversight through the Law Society of Ontario. Therefore, Option C is the correct choice as it directly addresses the exemption that lawyers have from registering under REBBA due to their legal credentials and oversight by the Law Society.