Based on the following phenotypes, which pair of cells would make the best screening cells?
a. Cell 1: Group A, D+C+c–E–e+, K+, Fy(a+b–), Jk(a+b–), M+N–S+s– Cell 2: Group O, D+C–c+E+e–, K–, Fy(a–b+), Jk(a–b+), M–N+S–s+
b. Cell 1: Group O, D–C–c+E–e+, K–, Fy(a–b+), Jk(a+b+), M+N–S+s+ Cell 2: Group O, D+C+c–E–e+, K–, Fy(a+b–), Jk(a+b–), M–N+S–s+
c. Cell 1: Group O, D+C+c+E+e+, K+, Fy(a+b+), Jk(a+b+), M+N–S+s+ Cell 2: Group O, D–C–c+E–e+, K–, Fy(a+b–), Jk(a+b+), M+N+S–s+
d. Cell 1: Group O, D+C+c–E–e+, K+, Fy(a–b+), Jk(a–b+), M–N+S–s+ Cell 2: Group O, D- C–c+E+e–, K–, Fy(a+b–), Jk(a+b–), M+N–S+s–