i agent is permitted to share in the gain and loss of a customer account if a joint account is opened with the customer and sharing is proportional to capital contributed ii agent is not permitted to share in the gain and loss of a customer account if a joint account is opened with the customer and sharing is proportional to capital contributed iii investment adviser representative is permitted to share in the gain and loss of a customer account if a joint account is opened with the customer and sharing is proportional to capital contributed iv investment adviser representative is not permitted to share in the gain and loss of a customer account if a joint account is opened with the customer and sharing is proportional to capital contributed