As a CFA charterholder working as a portfolio manager at a large investment firm, you are approached by a client who requests you to invest a remarkable portion of their portfolio in a specific technology stock. The client also mentions that this might be an opportunity for quick gains and urges you to act without delay. However, you are aware that this stock is currently overvalued and does not fit the investment strategy your firm has set for its clients. Moreover, your firm has a policy against investing more than 5% of a client's portfolio in any one stock.
Your senior manager also emphasizes the importance of adhering to the firm’s investment guidelines. How should you respond to the client’s request while upholding your responsibilities to your employer?