which version should I use for ICX ?

Hi there,I have two questions regarding to version string.I’ve listed sample below.- Ruckus ICX FastIron 08.0.80b (GA)- Ruckus ICX FastIron 08.0.80 (GA)- FastIron 08.0.70a- FastIron 08.0.70 (GA)q1) Does Ruckus string have any mean? I am wondering if this version has been released since the Ruckus take over the ICX models.q2) I usually choice GA version when I download MySQL.Is there any difference between GA or not?what is the best choice if choose one of alove.Thanks