How to check if HACMP is running on AIX node?

Hello AIX experts,

I have few queries and appreciate if you could help me with them.

1. How to check if HACMP (or any other AIX OS cluster) is installed
2. How to check if HACMP (or any other AIX OS cluster) is running
3. how to check which Oracle DB instance is running on it
4. how to check if oracle DB is application-level clustered or OS-level (HACMP or other) clustered

Many thanks in advance!