If ΔSIN ≅ ΔCOS, which of the following is NOT true?

a. ∠I ≅ ∠O
b. ∠S ≅ ∠C
c. IN̅̅̅ ≅ OC̅̅̅̅̅
d. NI̅̅̅ ≅ SO̅̅̅̅̅​