The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003.
The second satellite was named BeiDou-12b and was launched in December of what year? (If the question is unanswerable, say "unanswerable")
unanswerable