Which of the following pairs of d-electron configuration exhibit both low and high spin tetrahedral complex

Which of the following pairs of d-electron configuration exhibit both low and high spin octahedral complexes? d^(2),d^(3) , d^(7),d^(10) , d^(8),d^(9) , d^(5),d^(6)

Which of the following is a low spin complex?

Which of the following is low spin complex

Electronic configuration od d^8 system in low spin octahedral complex