When You Place a Button Named OkButton on a Form

Multiple Choice

When you place a button named okButton on a Form in the IDE and double-click it, what method header is generated automatically? (Note that if you are using Visual Studio 2019, each method name will start with an uppercase letter.)

A) public void okButton_Click(object sender, EventArgs e)
B) private void okButton_Click(object sender, EventArgs e)
C) static void okButton_Click(object sender, EventArgs e)
D) private int okButton_Click(object sender, EventArgs e)