Which is NOT one of the four colors used for passport covers?

Here is the question :

WHICH IS NOT ONE OF THE FOUR COLORS USED FOR PASSPORT COVERS?

Here is the option for the question :

• Red
• Blue
• Green
• White

The Answer:

And, the answer for the the question is :

Explanation:

[STC0020080]. Take a glance at the passports the next time you’re in line at customs; you could discover a pattern. Passports are only available in four colors over the world: red, blue, green, and black. While there are no official color regulations, the restricted range is due to the fact that these plain, dark hues make the documents appear more official. Blue is the most popular color.