A. If you have reached the age to take RMD but are still working and participating your current employer's 401k, then no RMD is required from this account. However, RMD is still required from your previous employers' 401k accounts.
Here is a little trick - rollover your 401k money from the previous employers' retirement accounts to your current employer's 401k account, in this way, you can delay paying RMD for those accounts.
Please note you are still required to pay the RMD for those accounts for the current year, but once rolled over, no RMD on those accounts anymore.