Give the logical variables X=Y=1，The value of X V Y(logical addition)is （）

A．SELECT A,B FROM R,S WHERE C＜B
B．SELECT R.A,S.B FROM R,S WHERE R.C＜S.B
C．SELECT 1,5 FROM R WHERE C＜(SELECT B FROM S)
D．SELECT A,B FROM RWHERE C＜(SELECT B FROM S)

A．管道
B．批处
C．初始装入
D．系统生成