The requestUri parameter must be a HTTPS address and you call the AuthenticateAsync method to connect to the online identity provider and get an access token31. You want to create a class of which only a single instance can exist. Which design pattern best fits this objective?

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The requestUri parameter must be a HTTPS address and you call the AuthenticateAsync method to connect to the online identity provider and get an access token<br>31. You want to create a class of which only a single instance can exist. Which design pattern best fits this objective?