What stages of T-cell development (DN1, DN2, DN3, DN4, DP, CD4 SP, or CD8) following genetic modifications?
a. Mice that do not express MHC class II - DN1
b. Mice that do not express AIRE - DP
c. Mice that do not express CD3 - DN4
d. Mice that do not express CD28 - CD8 SP