A) Your aircraft is likely to be configured in such a way that the TCAS system is aware of this and they will coordinate in such a way that you will not get a climb RA.
I don't know all the different TCAS systems out there, but in my NG the TCAS does not know if I am flying at maximum altitude.
The manual clearly states that the TCAS may issue climb commands that exceeds the climb capability of the aircraft.
Does this stop me from cruising at maximum altitudes? No.