Which of the following classes is required to draw an empty circle? (Choose all that apply.)

1. System.Drawing.Graphics
2. System.Drawing.Pen
3. System.Drawing.Brush
4. System.Drawing.Bitmap

Answer:

1. System.Drawing.Graphics
2. System.Drawing.Pen

Graphics class is required to draw the empty ellipse in the form of a circle,
Pen class is required to set the border properties of the circle to be drawn.