You have two boxes of colored pens. The first box contains a red pen, a blue pen, and a green pen. The second box contains a yellow pen, a red pen, and a black pen. Which set represents all the colors of the pens?
(1 point)
Responses
{red, blue, green}
{red, blue, green}
{red}
{red}
{red, red, blue, green, yellow, black}
{red, red, blue, green, yellow, black}
{red, blue, green, yellow, black}