If the System.Windows.Forms namespace is imported, the following statement:

this.textbox1 = new System.Windows.Forms.TextBox( );

can be written as:

a. this.textbox1 = new TextBox( );

b. textbox1 = new TextBox( );

c. textbox1 = new System.Windows.Forms.TextBox( );

d. all of the above

e. none of the above