The correct answer is: "wear yellow stars"
This was one of the first discriminative measures that affected Jewish people in nazi Germany. They were required to wear distinctives with a yellow star, that enabled to differentiate them from other German citiznes. A photo of this distinctive has been attached.
The scale of discrimination against the Jewish kept on growing at a very fast speed. After they were discriminated in every aspect in their everyday lives, they were forced to move to restricted areas within each city: the ghettos. Moreover, some time later, they were deported to concentration camps and extermined in death camps in order to accomplished what the nazi authorities denominated the Final Solution to the Jewish Question.