QUESTION 10 Code example 1: Dim paymentEntry Form As New frmPaymentEntry paymentEntry Form.vendorName = NameComboBox. Text paymentEntryForm.invoice = invoice Dim result As DialogResult = paymentEntryForm. ShowDialog (Refer to code example 1.) For this code to work, vendorName and invoice must be defined as a. public variables on the Payment Entry form b. parameters on the Payment Entry form C. a text box and a DataGridView control on the Payment Entry form d. private variables on the Payment Entry form