Final answer:
The most commonly used data entry mechanism is the keyboard and mouse, despite the existence of specialized systems such as electronic touch screen voting systems for specific applications like voting.
Step-by-step explanation:
The most widely used mechanism for data entry is b. Keyboard and mouse. This method has been the standard for personal computer interaction since the popularization of desktop computers. Though other methods such as voice recognition systems, scanners, and signature pads are employed in specific contexts, the ubiquity of the keyboard and mouse setup makes it the primary tool for data entry across various applications.
In the context of voting systems, historically, various mechanisms have been used, including mechanical voting machines, punch-card machines, and, more recently, electronic touch screen voting systems. Today, touch-screen systems are increasingly popular owing to their convenience and efficiency. However, when it comes to broadly used data entry across multiple domains, the keyboard and mouse remain the most commonly utilized devices.