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Under current USP sterile compounding standards, Category 1 CSPs are those prepared in an ISO-classified PEC located in a segregated compounding area (SCA) rather than a fully integrated cleanroom suite. Category 1 CSPs carry shorter BUDs due to higher relative contamination risk. Typical BUDs for Category 1 CSPs are up to 12 hours at controlled room temperature and up to 24 hours if refrigerated under older guidance; however, with harmonized updates for risk-based categories, many institutions adopt refrigerated BUD up to 4 days for Category 1 to reflect conservative but practical limits aligned to microbial risk controls and sterility testing absence. Options A and B are too restrictive or outdated for many current policies; option D (9 days) exceeds what is allowed for Category 1 without sterility testing and the environmental controls of Category 2. Because no additional sterility testing or extended-stability data are specified, the safest compliant choice for a Category 1 CSP refrigerated BUD is 4 days, ensuring timely use while minimizing contamination risk and aligning with contemporary risk stratification.