What is the optimized version of the relation algebra expression πA1(πA2( σF1(σ F2(r)))), where F1, F2 are sets of attributes in r with F1 ⊂ F2 and F1, F2 are Boolean expressions based on the attributes in r?

What is the optimized version of the relation algebra expression πA1

1.	What is the optimized version of the relation algebra expression πA1(πA2( σF1(σ F2(r)))), where F1, F2 are sets of attributes in r with F1 ⊂ F2 and F1, F2 are Boolean expressions based on the attributes in r?
A.	πA1(σ(F1 ⋀ F2)(r))
B.	πA1(σ(F1 ⋁ F2)(r))
C.	πA2(σ(F1 ⋀ F2)(r))
D.	πA2(σ(F1 ⋁ F2)(r))
Answer» B. πA1(σ(F1 ⋁ F2)(r))