Explanation:

- Statement: GVA can display 256,000 colors.

- This typically means the device or system can generate and differentiate 256,000 distinct color shades in total.

- Options for simultaneous colors:

- Option 1: 4

Systems with very limited palettes, like early gaming systems, often displayed 4 colors at once.

- Option 2: 16

Useful for basic graphics modes where finer details are unnecessary.

- Option 3: 64

A moderate number providing a bit more richness than very early systems.

- Option 4: 256

Commonly used in systems where a reasonable variety of colors is necessary, like the VGA mode of old PC displays.

- Correct Answer:

- The correct option is that 256 colors can be used simultaneously, which is often associated with systems using 8-bit color depth for display.

Correct Answer is Option 4: 256