…has been vaccinated against COVID-19.
…has been vaccinated against COVID-19 or has been in quarantine for a certain period of time.
…has been vaccinated against COVID-19 or has tested negative.
…has been vaccinated against, tested negative for, or recovered from COVID-19.

respondent's answer to the skill question "What exactly does proof of a valid Swiss Covid certificate entail? That the person in question…" about the federal proposal "Änderung vom 19. März 2021 des Bundesgesetzes über die gesetzlichen Grundlagen für Verordnungen des Bundesrates zur Bewältigung der Covid-19-Epidemie (Covid-Gesetz)" (4th answer is correct; only voters)

All federal pandemic measures will be repealed and instead the cantons will be given additional powers in pandemic response.
Those provisions/amendments adopted by the Federal Assembly on March 19, 2021, cease to apply immediately.
Those provisions/amendments adopted by the Federal Assembly on March 19, 2021, expire on March 19, 2022
The entire Covid-19 Act will expire no later than the end of the year.

respondent's answer to the skill question "What happens if the changes to the Covid-19 Act are rejected?" about the federal proposal "Änderung vom 19. März 2021 des Bundesgesetzes über die gesetzlichen Grundlagen für Verordnungen des Bundesrates zur Bewältigung der Covid-19-Epidemie (Covid-Gesetz)" (3rd answer is correct; only voters)

whether or not the respondent used free newspapers and free online journalism / news sites to learn about the federal proposals (only voters)

whether or not the respondent used paid newspapers / magazines (on- and offline) to learn about the federal proposals (only voters)

whether or not the respondent used the official federal voting booklet to learn about the federal proposals (only voters)

whether or not the respondent used radio programs to learn about the federal proposals (only voters)

whether or not the respondent used television programs to learn about the federal proposals (only voters)

whether or not the respondent used the official federal webpage to learn about the federal proposals (only voters)