The statement that registers a Button object click event with the operating system is:

a. this.button1ClickEvent = new System.Windows.Forms.Button( );

b. private System.Windows.Forms.Button button1ClickEvent;

c. this.Controls.AddRange(this.button1ClickEvent);

d. button1.Click = "Register Me";

e. button1.Click += new System.EventHandler

(this.button1_Click);