You create Microsoft Windows-based applications. You are developing an application that will be used by stock traders. The project scope contains the following requirements:

The application must permit users to set thresholds for minimum and maximum values for different stocks.
The application must alert the user when stock prices reach the pre-defined thresholds.
The application must permit the user to either buy or sell stock and specify the quantity of stock to trade.
The application must permit multiple alerts to be displayed simultaneously.

You need to decide how to implement the alert mechanism.
What should you do?

A.
Use a modal dialog box to show each alert and to permit the user to trade stocks.

B.
Use a message box to show each alert and the main application form to permit the user to trade stocks.

C.
Use a BalloonTip control to display multiple alerts and the main application form to permit the user to trade stocks.

D.
Use a custom BalloonTip control to display multiple alerts and to permit the user to trade stocks.