Answer: External stage

The question asks which stage type can be both altered and dropped. According to Snowflake documentation and the community discussion consensus (with B receiving 100% of votes), external stages are the correct answer. External stages (named stages) can be both altered using ALTER STAGE and dropped using DROP STAGE. Database stages, table stages, and user stages have limitations: table stages cannot be directly altered or dropped independently (they're tied to the table), user stages cannot be altered or dropped directly, and database stages also have restrictions. The community comments confirm that only named stages (which include external stages) can be dropped, and external stages specifically support both alteration and dropping operations.

Author: LeetQuiz Editorial Team