Δ and Δ are isosceles right triangles. ̅̅̅̅≅̅̅̅̅ and ̅̅̅̅≅̅̅̅̅, which of the following statements is true by CPCTC?

a. ̅̅̅̅≅
b. ̅̅̅̅≅
c. ̅̅̅̅≅ ̅̅̅̅
d. ̅̅̅̅≅̅̅̅̅​