Visual Basic语言程序设计单选题中等
以下哪一项代码能正确地定义并调用一个Function函数？
AFunction sum(x As Integer, y As Integer) As Integer
Return x + y
End Function
Call sum(2, 3)
BFunction sum(x As Integer, y As Integer) As Integer
sum = x + y
End Function
sum(2, 3)
CFunction sum(x As Integer, y As Integer)
Return x + y
End Function
sum(2, 3)
DFunction sum(x As Integer, y As Integer) As Integer
Return x + y
End Function
sum(2, 3) = 5