The answer is currency. It refers to the <span>paper money and coins that are in circulation in a nation and that make up its money supply. The currency per nation may differ depending on the state of the economy. Equivalent rates regarding the currency between countries may also change depending on the economy's strength.</span>
I think a, or d, but I can't say for certain. I am sorry.
Perhaps the most successful way we've been able to use light to transfer information is fiber optics. ... Through rapid changes in the light, you can send highly complex signals down the cable. These are most often used either for high speed internet connections, or for sending sound signals to home theater systems.
