B cell development - match the following: Early Pro-B cell A. Heavy Chain D-J rearrangement Late Pro-B cell B. Heavy Chain V-DJ rearrangement Large Pre-B cell C. Pre-BCR expression followed by proliferation Small Pre-B cell D. Light chain V-J rearrangement Immature B cell E. Expresses lgM but not lgD Mature B cell F. Expresses lgM and lgD.