NEW DELHI, Oct. 9 -- The Opposition Grand Alliance is close to striking a final seat arrangement deal and is considering appointing three deputy chief ministers -- one each from the Dalit, Muslim and extremely backward classes communities-if it comes to power in Bihar after the assembly elections, senior RJD and Congress leaders said on Wednesday. The Grand Alliance's de-facto chief ministerial face is Rashtriya Janata Dal leader Tejashwi Yadav, who hails from a backward community and has served as deputy CM twice, though his allies are yet to formally back him for the chair. He will face off against chief minister Nitish Kumar of the National Democratic Alliance, which also has two deputy CMs-Samrat Chaudhary (OBC) and Vijay Kumar Sinha (B...