对数据库数据的删除是由数据库管理系统的哪个功能模块实现的？（）

A．SELECT S#，SNAME FROM S WHERE S# = (SELECT SS# FROM SC WHERE C# = 'C2' )
B．SELECT S#，SNAME FROM S，SCWHERE S# = SS# AND C# = 'C2'
C．SELECT S#，SNAME FROM S，SC WHERE S# = SS# AND C# = 'C2' ORDER BY S#
D．SELECT S#，SNAME FROM S WHERE S# IN (SELECT SS# FROM SC WHERE C# ='C2' )

A．S和SC
B．SC和C
C．S和C
D．S、SC和C