Consider the relation X(P, Q, R, S, T, U) with the following set of functional dependenciesF = { {P, R} → {S,T}, {P, S, U} → {Q, R} }Which of the following is the trivial functional dependency in F+ is closure of F?

• A. {P,R}→{S,T}
• B. {P,R}→{R,T}
• C. {P,S}→{S}
• D. {P,S,U}→{Q}