Final answer:
Mumbai Indians (MI) cricket team participates in the Indian Premier League (IPL), which is organized by the BCCI and operates independently of regional cricket boards.
Step-by-step explanation:
The student is asking which regional board the Mumbai Indians (MI) cricket team participates in and accepts. The Mumbai Indians are a franchise cricket team based in Mumbai, Maharashtra, that plays in the Indian Premier League (IPL). The IPL is not affiliated with regional cricket boards but is a club-level competition organized by the Board of Control for Cricket in India (BCCI), which is the national governing body for cricket in India. Although individual players may be associated with regional boards due to their domestic teams, the IPL and its franchises operate independently of these entities.