给定元组演算表达式R*={t│(Эu)(R(t)∧S(u)∧t[3]<u[2])} ,若关系R、S如下图所示,则( )。A.R*={(3,7,11),(5,9,13),(6,10,14)}B.R*={(3,7,11),(4,5,6),(5,9,13),(6,10,14)}C.R*={(1,2,3),(4,5,6),(7,8,9)}D.R*={(1,2,3),(4,5,6),(7,8,9),(10,11,12)}