In the following Exercises 4.3.13 through 4.3.18,

suppose the selector of a Select Case block, word, evaluates to a String value.

Determine whether the Case clause is valid.

Private Sub btnAnalyze_Click(...) Handles btnAnalyze.Click Dim word As String Select Case word Case "un" & "til" ... Case "hello", Is < "goodbye" ... Case 0 To 9 ... Case word <> "No" ... Case "abc".Substring(0, 1) ... Case Is <> "No" ... End Select End Sub 

Case "un" & "til"

Case "hello" Is < "goodbye"

Case 0 To 9

Case word <> "No"

Case "abc".Substring(0, 1)

Case Is <> "No"

None is a correct answer.