4. Suppose you want to verify that the user has entered a value into a text box named txt Input. Which of the following code segments responds with an appropriate

message if the user does not enter a value? а. If txtInput.text <> "" Then lblStatus.Text = “No data has been entered" End If b.If txtInput.Text =" "Then lblStatus.Text = "No data has been entered" End If If txtInput <> String. Empty ThenC. lblStatus.Text = “No data has been entered" End If d.If txtInput.Text=String.Empty Then lblStatus.Text= “No data has been entered" End If