Specify the coordination geometry around and hybridization of N and B complex of NH3 and BF3 : (IIT 2002)
a. N : tetrahedral, sp3 ; B : tetrahedral, sp3
b. N : pyramidal, sp3 ; B : pyramidal, sp3
c. N : pyramidal, sp3 ; B : planar, sp3
d. N : pyramidal, sp3 ; B : tetrahedral, sp3