Visually impaired people cannot use a mouse to navigate web pages. How can web page designers ensure that such individuals can navigate a web page without difficulty? Visually impaired individuals generally rely on the [keyboard] for navigation. Thus, designers need to ensure that mouse-specific inputs, such as pointing, clicking, and hovering, can be done without a mouse. 
a) Mouse 
b) Touchscreen 
c) Keyboard 
d) Voice recognition