The correct answer is B because scoped URLs in Snowflake expire when the persisted query result period ends, which is currently 24 hours. This is clearly documented in Snowflake's official documentation and confirmed by the community discussion where option B has overwhelming consensus (95% of answers) and multiple upvoted comments reference the official documentation. Option A is incorrect because data cache clearing is unrelated to scoped URL expiration. Option C describes encoded URLs, not scoped URLs. Option D describes pre-signed URLs, not scoped URLs.