| a. Intersection of D(A) and R is empty, where D(A) represents diagonal of set |
| b. R⁻¹ is a subset of R, where R⁻¹ represents inverse of R |
| c. Intersection of R and R⁻¹ is D(A) |
| d. D(A) is a subset of R, where D(A) represents diagonal of set |
| Answer: Intersection of D(A) and R is empty, where D(A) represents diagonal of set |