I want to know the answer to the following question:
When was the first satellite for the BeiDou-2 system launched?
All the background I'm provided with is that "In April 2007, the first satellite of BeiDou-2, namely Compass-M1 (to validate frequencies for the BeiDou-2 constellation) was successfully put into its working orbit.". Is that enough to answer the question?
Answer: yes