Sonia,
With regards to your Rad Alt question, yes the Rad Alts are calibrated to take the flare into account. Next time you're taxiing or at the gate, have a look at the Rad Alt display on your EFIS. The figure (from memory) is -6ft. The Rad Alt Antennae are in front of the Main Gear, so raise the nose for the flare and there's your zero!
Bill