An icon of stacked sheets displays on the tabs of grouped worksheets

A user is searching for a piano keyboard to connect to a PC. The user would like the keyboard to communicate with the PC. Which of the following features should the user look for on a piano keyboard to BEST facilitate this?

A. MIDI B. USB C. TCP D. HDM

What will be the output of the following program when the button is clicked on?

``` Private Sub btnDisplay_Click(...) Handles btnDisplay.Click Dim var1, var2, num As Integer var1 = 2 var2 = 4 num = 6 Add(num) txtBox.Text = CStr(num) End Sub Sub Add(ByRef num As Integer) Dim var1, var2 As Integer num = var1 + var2 End Sub ``` (A) 0 (B) 12 (C) 6 (D) None of the above