MBWEII (blue) hard disk drive (green) upgrade?



I have a WD15000D033 MBWE II (blue rings) device with 2x 750 Blue Edition (WD7500AAKS) HDD’s (Raid 1).

I would like to insert 2x 1TB Green Edition (WD10EADS) or if it is possible 2x 1,5TB or 2x 2TB.

a) Are the green edition drives compatible with the MBWEII (blue) ?

b) What is the max size (2x 1TB or 2x 1,5TB or 2x 2TB) ?

c) How can I transfer the OS of the MBWEII onto the new drives ?

d) Something else I have to consider ?