JavaScript drawing skills

Front

Consider the JavaScript code shown in the picture. If the code runs every 20 milliseconds, what is the effect on the arc that is drawn on the canvas?

Back

The arc moves vertically between y = 0 and y = 250.

Front

Consider the JavaScript code shown in the image. You expect the arc to move left to right on the canvas, but you find that it is moving up and down. How do you fix the code to create the movement effect you want? Options: replace ctx.arc(400, x, 20, Math.PI *2, false); with replace ctx.arc(x, 400, 20, Math.PI *2, false);, replace ctx.arc(400, x, 20, Math.PI *2, false); with replace ctx.arc(x, x, 20, Math.PI *2, false);, Set 'x += dx;' to 'x -= dx;' instead., replace ctx.arc(400, x, 20, Math.PI *2, false); with replace ctx.arc(400, 50, x, Math.PI *2, false);

Back

replace ctx.arc(400, x, 20, Math.PI *2, false); with replace ctx.arc(x, 400, 20, Math.PI *2, false);

Front

Consider the JavaScript code shown in the image. You expect the arc to move, but it does not appear on the canvas. How do you fix the code?

Back

Change 'setInterval(draw, 20);' to 'setInterval(drawIt, 20);'