Q:Question:Question 5. Relational Algebra and Optimization Consider a database with three relations: R(A, B) S(B, C) T(C, D). Q5.1 Translate the following query into relational algebra expression. (6 marks) [ SELECT R . A, S . D R �· A, T �· D; FROM R, S, T; WHERE R.B = S.B; AND S.C =T . C;