The correct answer is: A. ByRef
The ByRef keyword tells the computer to pass the variable’s address rather than its contents. This means that any changes made to the variable in the called procedure will be reflected in the calling procedure.
The ByVal keyword tells the computer to pass the variable’s contents rather than its address. This means that any changes made to the variable in the called procedure will not be reflected in the calling procedure.
The ByAdd keyword is not a valid keyword in Visual Basic.
The ByPoint keyword is used to pass a point value to a procedure. A point value is a pair of numbers that represent the x- and y-coordinates of a point.
Here is an example of how to use the ByRef keyword:
“`
Sub Main()
Dim x As Integer = 10
Dim y As Integer = 20
Call ChangeValues(x, y)
Console.WriteLine(x) ‘Output: 20
Console.WriteLine(y) ‘Output: 20
End Sub
Sub ChangeValues(ByRef x As Integer, ByRef y As Integer)
x = x + 10
y = y + 10
End Sub
“`
In this example, the variables x and y are passed by reference to the ChangeValues procedure. This means that any changes made to x and y in the ChangeValues procedure will be reflected in the calling procedure.
When the ChangeValues procedure is called, the values of x and y are copied to the local variables x and y in the ChangeValues procedure. The x and y variables in the ChangeValues procedure are then incremented by 10. When the ChangeValues procedure returns, the values of x and y in the calling procedure are updated to reflect the changes that were made in the ChangeValues procedure.