Which of the following exists in a one - party state?

The option that exists in a one-party state is "The ruling party is the only legal party." A one-party state is a form of government where a single political party has the exclusive right to form the government and control the state. In such a state, the ruling party has a monopoly on power and is not challenged by opposition parties. Therefore, the ruling party is the only legal party allowed to exist in such a state. This means that all other political parties are banned, and citizens are not allowed to participate in any political activities outside the ruling party. As a result, elections are not competitive, and political power is consolidated within the ruling party.