Answer:
The answer is option "D"
Step-by-step explanation:
The suitability condition that broker-dealer firms have to adopt includes making investment recommendations on the basis of their applicability in terms of what the customer's profile is. To do this, the firm needs to have adequate and reasonable understanding of the customer, their needs, their risk profile, details of their other investments and their age among several other factors. Firms use these details and then perform their own research, or 'due diligence' to ensure that the recommendations made are appropriate in the customer's context. Options A and B pertain to this criteria and are therefore correct. Option C is also correct since, even if the investment recommendation is in line with the customer's profile, firms must still refrain from making trade recommendations that are excessive in size because they can, among other issues, raise the risk profile of the trade.
Now lets look at option D. Broker-dealers do rely on the customers providing customer specific information so that they can plan investment recommendations accordingly, however, this is not the only practice that is required. Firms need to conduct their own research and due diligence as well. Furthermore, customers may be unwilling to disclose certain information, for example, details of their other investments. In this case, firms need to be cautious and carefully analyse whether they have 'enough' customer specific information to be reasonably certain that the investment recommendation is appropriate. As long as enough information exists to form the reasonable basis, firms do not need to refrain from making recommendations.
Therefore, the correct option is D.