Authorized electronic transfers involving client trust accounts shall be limited to:

(a) money required for payment to a client or third person on behalf of a client;

(b) expenses properly incurred on behalf of a client, such as filing fees or payment to third persons for services rendered in connection with the representation; 

(c) money transferred to the lawyer for fees that are earned in connection with the representation and are not in dispute; and

(d) money transferred from one client trust account to another client trust account.